This is the C11/D/E Igniter Plugs for Flying Model Rockets from Estes. Suitable for Ages 10 & Older with Adult Supervision for Those Under 12. FEATURES: 2 different colors of igniter plugs for C11/D/E engines INCLUDES: C11/D/E Igniter Plugs REQUIRES: Adult Supervision 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