This is the E16-4 29mm Single Stage Model Rocket Engines/Motors from the Pro Series II by Estes. Suitable for Ages 10 & Older with Adult Supervision for Those Under 12. Do not burn, soak in water to destroy. 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. Residents of California, New Jersey, Rhode Island and North Dakota please review the Terms of Sale for state specific restrictions. Estes products may contain chemicals known to the State of California to cause cancer, birth defects or other repr