This is the Tube Coupler Assortment #2 from Estes. Suitable for Ages 10 & Older with Adult Supervision for Those Under 12. FEATURES: Two couplers for BT-55, BT-56 and BT-60 body tubes One coupler for BT-80 body tube Instructions included INCLUDES: Two BT-55 tube couplers Two BT-56 tube couplers Two BT-60 tube couplers One BT-80 tube couplers COMMENTS: 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 kr6/21/01 ir/jl updated tlc 1/10/13