This is the Tube Coupler Assortment #2 from Estes.
Suitable for Ages 10 & Older with Adult Supervision for Those Under 12.
Two couplers for BT-55, BT-56 and BT-60 body tubes
One coupler for BT-80 body tube
Two BT-55 tube couplers
Two BT-56 tube couplers
Two BT-60 tube couplers
One BT-80 tube couplers
Due to small parts that could cause a choking hazard please keep
away from children 3 years of age and younger
For your safety and enjoyment, always follow the NAR Model Rocketry
Safety Code while participating in any model rocketry activities