Engine Adapters Standard to D

This is the Standard to D Engine Adapters by Estes. Suitable for Ages 10 & Older with Adult Supervision for Those Under 12. FEATURES: Two simple steps transform a standard engine into a D size Insert a standard engine into the adapter, and insert the adapter into the rocket 3 adapters per pack Resuable Illustrated instructions included INCLUDES: 3 standard to D engine adapters 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