This is the Assortment of BT5-BT55 Centering Rings from Estes. Suitable for Ages 10 Older with Adult Supervision for Those Under 12. COMMENTS: Due to small parts that could cause a choking hazard please keep For your safety and enjoyment, always follow the NAR Model Rocketry Safety Code while participating in any model rocketry activities tlc 10/16/15
