UKROC 25 (2025) :: Centering rings & bulkheads

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BeginnersRocket sets for beginners to get you started

Full sets with motors

Ready to fly starter sets Starter sets that you build

More beginner rockets

Starter sets without motors Ready to fly rocket kits Easiest & E2X rocket kits Easy (Skill level 1) rocket kits

Other & accessories

Beginner's essentials Rocket gifts for all occasions Schools & clubs bulk sets

Beginner rockets.

Rocketry is a great exciting and educational hobby. Our beginner sets include all you need to get flying.

Great gifts for any age to learn the ropes before progressing to more challenging models.

Our Estes and Klima starter packs include motors, a launch pad and controller. There are a few listings that don't have it all but they are mentioned on the listings if you need additional items to fly.

Model rocket kitsAll sorts of kits from the tiny mosquito to huge challenges

By skill level

Ready to fly (RTF) & almost RTF Easiest (Launchables & E2X)Easy (Skill level 1)Medium (skill level 2)Challenging (Skill level 3,4,5+)

By type

MoreBeginner sets BIG Rockets Build your own design kits Clustered motor rockets Compressed air rockets Display models High flyers High power kits (G/H upwards)Mid Power (E,F,G) & Estes Pro Mini motor models (13mm)Multi stage rockets Out of production & Vintage rockets Payloaders Radio controlled R/C Rocket cars Rocket gliders & planes Scale model rockets UFO's, fun & random Water rockets

By brand

MoreApogee rocketry Estes rockets Klima rockets Launch lab rocketry LOC Precision Madcow rocketry North coast rocketry Public Missiles Ltd Wildman rocketry

Others

MoreBulk packs for schools & clubs Compressed air rockets Radio controlled R/C Rocket cars Rocket gliders & planes UFO's. fun & random Water rockets

By features

More13mm motor mount (up to A)18mm motor mount (A to D)24mm motor mount (C, D & E)29mm motor mount (F & G)38mm motor mount (G to J)Flies up to 250m Flies 250 - 500m Flies 500 - 1000m Flies 1000 - 2500m Flies over 2500m Under 25cm tall 25 - 50cm tall 50 - 100cm tall 100 - 150cm tall Over 150cm tall

Rocket motors etcA huge variety of model rocket motors and engines to pick from

Motors by brand

MoreAll rocket motors Estes rocket motors Klima rocket motors TSP rocket motors (D to F)TSP glider motors Cesaroni motors Team / Bulk packs

Motors by impulse letter

More1/4A motors 1/2A motors A motors B motors C motors D motors E motors F motors

Motors by diameter

More13mm diameter 18mm diameter 24mm diameter 29mm diameter Under 13mm diameter 15.2mm diameter 17.2mm diameter

Consumables & Accessories

MoreIgniters, starters & matches Wadding, baffles etc Motor adapters Motor mounts Motor blanks Motor retainers Batteries Special effects Field boxes / storage Team / Bulk motor packs

The best bit of rocketry.

Your motor choice has to be right for your rocket or self build masterpiece.
We have entered loads of data about every rocket engine we stock, this means that you can click on All rockets and use the filters to narrow down on the exact engine you need.

View and filter all rocket motors

Scratch buildingAll the parts and components to make your own rockets from scratch, upgrade or repair a kit

Materials & Components

MoreAdapter plates Body tubes / Air frames Body tube couplers Bulkheads Centering rings Couplers, rings and things Electronics bay kits (e-bay)Fiberglass parts & material Fins Hardware Launch lugs & rail buttons Motor adapters Motor mounts Motor retainers Motor tube Nose cones Sheet material Thrust plates Transition adapters

Recovery system

MoreBaffles Harnesses / Shock cord Parachutes Pistons Recovery hardware & electronics Streamers Wadding & protection

Tools, glues & kits

Building and finishing supplies Construction kits Glues & Glassing Tools

Other items

Books, software & media Threads

Electronics & payloadsAltimeters, trackers flight computers and much more

Altimeters

Batteries & Chargers

Alkaline & Other batteries Lithium batteries Chargers Battery holders & cable adapters Battery connectors

Cameras

Components

Capacitors

Deplyment & Dual deployment

Electronic accessories

Electronic (e-bay) kits

Flight computers

Rocket locators / GPS trackers

Hardware

MoreStandoffs Nuts and Bolts Eye bolts Swivel links Quick links T-nuts

More Electronics & payloads →

Electronics and payloads.

Rocketry is a great exciting and educational hobby. Our beginner sets include all you need to get flying.

Great gifts for any age to learn the ropes before progressing to more challenging models.

Our Estes and Klima starter packs include motors, a launch pad and controller. There are a few listings that don't have it all but they are mentioned on the listings if you need additional items to fly.

Ground equipmentGround support equipment! Launch pads, controllers and other bits and pieces.

Launch controllers

Launch pads, rail & rods

Launch pad accessories

Display stands

Batteries & Chargers

Igniters, starters & wadding

Field boxes / Storage

Accessories & others

Ground support equipment is essential for rocketry.

You need a launch pad and launch controller to launch your rockets from. You also need wadding (or re-usable options) to protect your parachute each time.

We recommend the durable Klima launch pad and their launch controllers let you install two PP3 9v batteries at once for some extra launching juice! The Klima pad can take a 3mm or 6mm rod as well as a launch rail if required for larger rockets.

The estes pads are also great and the Porta pad E is very good for mid sized rockets also.

Schools & clubsBulk packs for schools and clubs

Bulk packs of rockets

Packs that need some building Packs that are almost ready to fly

Bulk packs of motors

24 & 30 packs of rocket motors A & B motor smaller packs All motors with search filters

Competitions

UKROC 24 (11-18 years)

Addons & accessories

MoreAltimeters Launch controllers Launch pads Wadding & spare igniters Rocketry software Components to make your own

Bulk packs for schools and clubs

You can shop for bulk packs of rockets here. We list the packs of rockets on their own with bundles on the page so you can add everything you need in one click.

The bundles include motors, launch pad(s), launch controller(s), batteries and wadding. All you will need to run your club or rocket workshop will be the required tools and consumables for construction. Rocket manuals are on each page so you can check but in general with these starter kits you will likely need the following although not all of these are required by all kits.

Some wood glue (We like gorilla glue but all sorts of PVA should be OK).
Scissors, masking tape, sand paper, decorating supplies (pens etc).

UKROCThe UK Youth rocketry challenge for 2024, it's time to get cracking!

Gifts & eventsEvents, workshops & gifts in here

Gifts and wearables

Workshops & events

BrandsFull list of all brands in the store. Browse all brands

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US Dollars ($)
Australian dollar ($)
Canadian dollar ($)
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PLN (PLN)
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English (GB)

English (GB)
Deutsch (DE)
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Français (FR)
Italiano (IT)
Nederlands (NL)
Polski (PL)
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Beginners

Full sets with motors

Ready to fly starter sets

Starter sets that you build

More beginner rockets

Starter sets without motors

Ready to fly rocket kits

Easiest & E2X rocket kits

Easy (Skill level 1) rocket kits

Other & accessories

Beginner's essentials

Rocket gifts for all occasions

Schools & clubs bulk sets

Beginner rockets.

Rocketry is a great exciting and educational hobby. Our beginner sets include all you need to get flying.

Great gifts for any age to learn the ropes before progressing to more challenging models.

Our Estes and Klima starter packs include motors, a launch pad and controller. There are a few listings that don't have it all but they are mentioned on the listings if you need additional items to fly.
Model rocket kits

By skill level

Ready to fly (RTF) & almost RTF

Easiest (Launchables & E2X)

Easy (Skill level 1)

Medium (skill level 2)

Challenging (Skill level 3,4,5+)

By type

Beginner sets

BIG Rockets

Build your own design kits

Clustered motor rockets

Compressed air rockets

Display models

High flyers

High power kits (G/H upwards)

Mid Power (E,F,G) & Estes Pro

Mini motor models (13mm)

Multi stage rockets

Out of production & Vintage rockets

Payloaders

Radio controlled R/C

Rocket cars

Rocket gliders & planes

Scale model rockets

UFO's, fun & random

Water rockets

By brand

Apogee rocketry

Estes rockets

Klima rockets

Launch lab rocketry

LOC Precision

Madcow rocketry

North coast rocketry

Public Missiles Ltd

Wildman rocketry

Others

Bulk packs for schools & clubs

Compressed air rockets

Radio controlled R/C

Rocket cars

Rocket gliders & planes

UFO's. fun & random

Water rockets

By features

13mm motor mount (up to A)

18mm motor mount (A to D)

24mm motor mount (C, D & E)

29mm motor mount (F & G)

38mm motor mount (G to J)

Flies up to 250m

Flies 250 - 500m

Flies 500 - 1000m

Flies 1000 - 2500m

Flies over 2500m

Under 25cm tall

25 - 50cm tall

50 - 100cm tall

100 - 150cm tall

Over 150cm tall
Rocket motors etc

Motors by brand

All rocket motors

Estes rocket motors

Klima rocket motors

TSP rocket motors (D to F)

TSP glider motors

Cesaroni motors

Team / Bulk packs

Motors by impulse letter

1/4A motors

1/2A motors

A motors

B motors

C motors

D motors

E motors

F motors

Motors by diameter

13mm diameter

18mm diameter

24mm diameter

29mm diameter

Under 13mm diameter

15.2mm diameter

17.2mm diameter

Consumables & Accessories

Igniters, starters & matches

Wadding, baffles etc

Motor adapters

Motor mounts

Motor blanks

Motor retainers

Batteries

Special effects

Field boxes / storage

Team / Bulk motor packs

The best bit of rocketry.

Your motor choice has to be right for your rocket or self build masterpiece.
We have entered loads of data about every rocket engine we stock, this means that you can click on All rockets and use the filters to narrow down on the exact engine you need.

View and filter all rocket motors
Scratch building

Materials & Components

Adapter plates

Body tubes / Air frames

Body tube couplers

Bulkheads

Centering rings

Couplers, rings and things

Electronics bay kits (e-bay)

Fiberglass parts & material

Fins

Hardware

Launch lugs & rail buttons

Motor adapters

Motor mounts

Motor retainers

Motor tube

Nose cones

Sheet material

Thrust plates

Transition adapters

Recovery system

Baffles

Harnesses / Shock cord

Parachutes

Pistons

Recovery hardware & electronics

Streamers

Wadding & protection

Tools, glues & kits

Building and finishing supplies

Construction kits

Glues & Glassing

Tools

Other items

Books, software & media

Threads
Electronics & payloads

Altimeters

Batteries & Chargers

Alkaline & Other batteries

Lithium batteries

Chargers

Battery holders & cable adapters

Battery connectors

Cameras

Components

Capacitors

Deplyment & Dual deployment

Electronic accessories

Electronic (e-bay) kits

Flight computers

Rocket locators / GPS trackers

Hardware

Standoffs

Nuts and Bolts

Eye bolts

Swivel links

Quick links

T-nuts

Staging

Tether release

Cable & Cables

Micro controllers & computers

Micro controllers

Microcontroller accessories

Displays

Switches & buttons

Electronic / Wifi switches

Micro switches

Panel mounting switches & buttons

PCB mounting switches & buttons

Screw switches

Voltage regulation

Relays & Power control

Egg protectors

Electronic kits & soldering kits

Servos and Solenoids

Connetors & terminal blocks

Electronics and payloads.

Rocketry is a great exciting and educational hobby. Our beginner sets include all you need to get flying.

Great gifts for any age to learn the ropes before progressing to more challenging models.

Our Estes and Klima starter packs include motors, a launch pad and controller. There are a few listings that don't have it all but they are mentioned on the listings if you need additional items to fly.
Ground equipment

Launch controllers

Launch pads, rail & rods

Launch pad accessories

Display stands

Batteries & Chargers

Igniters, starters & wadding

Field boxes / Storage

Accessories & others

Ground support equipment is essential for rocketry.

You need a launch pad and launch controller to launch your rockets from. You also need wadding (or re-usable options) to protect your parachute each time.

We recommend the durable Klima launch pad and their launch controllers let you install two PP3 9v batteries at once for some extra launching juice! The Klima pad can take a 3mm or 6mm rod as well as a launch rail if required for larger rockets.

The estes pads are also great and the Porta pad E is very good for mid sized rockets also.
Schools & clubs

Bulk packs of rockets

Packs that need some building

Packs that are almost ready to fly

Bulk packs of motors

24 & 30 packs of rocket motors

A & B motor smaller packs

All motors with search filters

Competitions

UKROC 24 (11-18 years)

Addons & accessories

Altimeters

Launch controllers

Launch pads

Wadding & spare igniters

Rocketry software

Components to make your own

Bulk packs for schools and clubs

You can shop for bulk packs of rockets here. We list the packs of rockets on their own with bundles on the page so you can add everything you need in one click.

The bundles include motors, launch pad(s), launch controller(s), batteries and wadding. All you will need to run your club or rocket workshop will be the required tools and consumables for construction. Rocket manuals are on each page so you can check but in general with these starter kits you will likely need the following although not all of these are required by all kits.

Some wood glue (We like gorilla glue but all sorts of PVA should be OK).
Scissors, masking tape, sand paper, decorating supplies (pens etc).
UKROC
Gifts & events

Gifts and wearables

Workshops & events
Brands

Real stock in house

Knowledge base & support

90-day returns

Next day delivery order by 10am*

Confused on how to start? Read our help article here

Competitions and projects

UKROC 2025

Centering rings & bulkheads

Stock when you need it

Our website is stock controlled, so if it's in stock you'll get it within a day or two.

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We are VAT registered so your school or college should be able to reclaim the 20%.

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You can checkout on our website and still pay by Invoice (or card / PayPal etc), no setup needed just follow the instructions. And it won't delay your order either!

Centering rings & bulkheads

Centering rings and bulkheads are essential parts when building a rocket from scratch.
You can use centering rings to space tubes within tubes, an example of this is mounting your motor tube(s) within your main air-frame. We sell pretty much any size - size centering ring, so if something is missing do let us know!
Bulk heads are great for gluing in to couplers to attach eye bolts. This is a good solution to attach your payload section to your main rocket tube for example.

Example: You want to mount 3x 18mm motor tubes within a BT-70 rocket air-frame. Pick the twin pack of BT70 - 3x 18MM. This comes in a "T" version and standard version. The T version has rectangle slots for engine hooks by the tube holes.

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BT5-BT55 Centering rings (26 pieces)

CODE:

D-ES3175

0.0

Stock: 3 item(s)

32.25 PLN 26.89 PLN

+ −

Universal bulkhead / frame 76mm- Klima

CODE:

8513

0.0

Stock: 5 item(s)

22.36 PLN 18.64 PLN

+ −

18mm thrust ring, 6 pieces

CODE:

8054

0.0

Stock: 11 item(s)

17.10 PLN 14.26 PLN

+ −

2x BT80 65mm bulkhead with 5mm centre hole (3mm plywood)

CODE:

CR-BT80-BH5mm

0.0

Stock: 24 item(s)

29.77 PLN 24.80 PLN

+ −

Adapter plate 63mm with eyebolt - Klima

CODE:

8522

0.0

Stock: 5 item(s)

22.76 PLN 18.99 PLN

+ −

Universal bulkhead / frame 65mm- Klima

CODE:

K8512

0.0

Stock: 10 item(s)

18.19 PLN 15.16 PLN

+ −

Universal bulkhead / frame 54mm - Klima

CODE:

K8511

0.0

Stock: 9 item(s)

16.10 PLN 13.42 PLN

+ −

Universal bulkhead / frame 38.5mm - Klima

CODE:

K8510

0.0

Stock: 14 item(s)

14.51 PLN 12.08 PLN

+ −

24mm thrust ring, pack of 3, 23.8mm OD / 18.6mm ID

CODE:

502424011

0.0

Stock: 17 item(s)

14.06 PLN 11.73 PLN

+ −

Centering ring 25mm OD 19mm ID - for 26mm tubes (6 pieces)

CODE:

8071

0.0

Stock: 16 item(s)

17.10 PLN 14.26 PLN

+ −

Universal bulkhead / frame 99mm- Klima

CODE:

8514

0.0

Stock: 7 item(s)

25.94 PLN 21.62 PLN

+ −

Universal bulkhead / frame 49mm - Klima

CODE:

K505000004

0.0

Stock: 7 item(s)

16.10 PLN 13.42 PLN

+ −

2x BT80 65mm coupler bulkhead with 5mm centre hole (3mm plywood)

CODE:

CR-BT80-BHC5mm

0.0

Stock: 19 item(s)

29.77 PLN 24.80 PLN

+ −

Universal bulkhead / frame 72mm- Klima

CODE:

507500004

0.0

Stock: 5 item(s)

22.36 PLN 18.64 PLN

+ −

Adapter plate 47.5mm with eyebolt - Klima

CODE:

504904013

0.0

Stock: 12 item(s)

19.73 PLN 16.45 PLN

+ −

Adapter plate 51mm with eyebolt - Klima

CODE:

K8521

0.0

Stock: 5 item(s)

19.73 PLN 16.45 PLN

+ −

2x BT80 63.5mm coupler bulkhead with centre mark (3mm plywood)

CODE:

CR-BT80-BHCM

0.0

Stock: 24 item(s)

29.77 PLN 24.80 PLN

+ −

2x BT80 (65mm) 2x24mm centering ring (3mm plywood)

CODE:

CR-BT80-2x24

0.0

Stock: 23 item(s)

29.77 PLN 24.80 PLN

+ −

2x BT80 (65mm) 1x24mm centering ring (3mm plywood)

CODE:

CR-BT80-1x24

0.0

Stock: 22 item(s)

29.77 PLN 24.80 PLN

+ −

2x BT80 (65mm) 4x24mm centering ring (3mm plywood)

CODE:

CR-BT80-4x24

0.0

Stock: 25 item(s)

29.77 PLN 24.80 PLN

+ −

Adapter plate 37mm with eyebolt - Klima

CODE:

K8520

0.0

Stock: 10 item(s)

18.19 PLN 15.16 PLN

+ −

2x BT80 65mm bulkhead with centre mark (3mm plywood)

CODE:

CR-BT80-BHCM

0.0

Stock: 24 item(s)

29.77 PLN 24.80 PLN

+ −

2x BT80 (65mm) 3x24mm centering ring (3mm plywood)

CODE:

CR-BT80-3x24

0.0

Stock: 23 item(s)

29.77 PLN 24.80 PLN

+ −

Adapter plate 70mm with eyebolt - Klima

CODE:

507305013

0.0

Stock: 6 item(s)

28.53 PLN 23.76 PLN

+ −

2x BT80 (65mm) 2x18mm centering ring (3mm plywood)

CODE:

CR-BT80-2x18

0.0

Stock: 23 item(s)

29.77 PLN 24.80 PLN

+ −

2x BT80 (65mm) 3x18mm centering ring (3mm plywood)

CODE:

CR-BT80-3x18

0.0

Stock: 24 item(s)

29.77 PLN 24.80 PLN

+ −

2x BT80 (65mm) 3x24mm centering ring with cut out for retaining hook (3mm plywood)

CODE:

CR-BT80-3x24T

0.0

Stock: 22 item(s)

29.77 PLN 24.80 PLN

+ −

2x BT80 (65mm) 4x18mm centering ring (3mm plywood)

CODE:

CR-BT80-4x18

0.0

Stock: 25 item(s)

29.77 PLN 24.80 PLN

+ −

99mm (3.9") OD to 29mm ID Centering rings for LOC 3.9" (99mm) Airframe

CODE:

CR-3.90-29mm

0.0

Stock: 7 item(s)

67.69 PLN 56.41 PLN

+ −

Centering ring 34mm OD 19mm ID - Klima

CODE:

8053

0.0

Stock: 17 item(s)

17.10 PLN 14.26 PLN

+ −

2x BT80 (65mm) 1x29mm centering ring (3mm plywood)

CODE:

CR-BT80-1x29

0.0

Stock: 4 item(s)

29.77 PLN 24.80 PLN

+ −

2x BT80 (65mm) 1x24mm centering ring with cut out for retaining hook (3mm plywood)

CODE:

CR-BT80-1x24T

0.0

Stock: 23 item(s)

29.77 PLN 24.80 PLN

+ −

2x BT80 (65mm) 2x18mm centering ring with cut out for retaining hook (3mm plywood)

CODE:

CR-BT80-2x18T

0.0

Stock: 25 item(s)

29.77 PLN 24.80 PLN

+ −

2x BT80 (65mm) 1x38mm centering ring (3mm plywood)

CODE:

CR-BT80-1x38

0.0

Stock: 25 item(s)

29.77 PLN 24.80 PLN

+ −

2x BT80 (65mm) 5x18mm centering ring with cut out for retaining hook (3mm plywood)

CODE:

CR-BT80-5x18T

0.0

Stock: 25 item(s)

29.77 PLN 24.80 PLN

+ −

Laser cut Centering Rings and Paper Adapters - Estes

CODE:

D-ES3179

0.0

Stock: 13 item(s)

37.92 PLN 31.61 PLN

+ −

2x BT80 (65mm) 5x18mm centering ring (3mm plywood)

CODE:

CR-BT80-5x18

0.0

Stock: 25 item(s)

29.77 PLN 24.80 PLN

+ −

2x BT80 (65mm) 3x18mm centering ring with cut out for retaining hook (3mm plywood)

CODE:

CR-BT80-3x18T

0.0

Stock: 25 item(s)

29.77 PLN 24.80 PLN

+ −

2x BT80 (65mm) 4x18mm centering ring with cut out for retaining hook (3mm plywood)

CODE:

CR-BT80-4x18T

0.0

Stock: 25 item(s)

29.77 PLN 24.80 PLN

+ −

Adapter plate 97mm with eyebolt - Klima

CODE:

8524

0.0

Stock: 5 item(s)

33.15 PLN 27.63 PLN

+ −

3" (76mm) centering rings 2x 29mm tube holes

CODE:

CR-300-2x29mm

0.0

Stock: 3 item(s)

58.94 PLN 49.10 PLN

+ −

2x BT80 (65mm) 1x18mm centering ring (3mm plywood)

CODE:

CR-BT80-1x18

0.0

Stock: 25 item(s)

29.77 PLN 24.80 PLN

+ −

2x BT80 (65mm) 4x24mm centering ring with cut out for retaining hook (3mm plywood)

CODE:

CR-BT80-4x24T

0.0

Stock: 25 item(s)

29.77 PLN 24.80 PLN

+ −

2x BT80 (65mm) 6x18mm centering ring with cut out for retaining hook (3mm plywood)

CODE:

CR-BT80-6x18T

0.0

Stock: 25 item(s)

29.77 PLN 24.80 PLN

+ −

Adapter plate 73mm with eyebolt - Klima

CODE:

8523

0.0

Stock: 11 item(s)

28.53 PLN 23.76 PLN

+ −

3" (76mm) centering rings 3x 29mm tube holes

CODE:

CR-300-3x29mm

0.0

Stock: 8 item(s)

58.94 PLN 49.10 PLN

+ −

2x BT80 (65mm) 6x18mm centering ring (3mm plywood)

CODE:

CR-BT80-6x18

0.0

Stock: 25 item(s)

29.77 PLN 24.80 PLN

+ −

2x BT80 (65mm) 2x24mm centering ring with cut out for retaining hook (3mm plywood)

CODE:

CR-BT80-2x24T

0.0

Stock: 25 item(s)

29.77 PLN 24.80 PLN

+ −

2x BT80 (65mm) 1x18mm centering ring with cut out for retaining hook (3mm plywood)

CODE:

CR-BT80-1x18T

0.0

Stock: 23 item(s)

29.77 PLN 24.80 PLN

+ −

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Brand

- Estes
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- Modelrockets.co.uk
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In stock

- In stock
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Diameter

- 18mm
- 23.8mm
- 25mm
- 34mm
- 63.5mm
- 65mm
- 76mm
- 99mm
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Dimensions

- 23.8mm x 6.7mm
- 2x 76mm x 3.2mm
- 3mm x 63.5mm
- 3mm x 65mm
- 99mm OD - 29mm ID
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Inside diameter

- 18.6mm
- 19mm
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Outside diameter

- 18mm
- 23.8mm
- 34mm
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Rocket length

–

UN Classification

- Not dangerous goods
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Weight

- 2.4g
- 2.5g
- 2.7g
- 2.8g
- 3.2g
- 3.3g
- 3.4g
- 3.7g
- 3.8g
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