Aerotech 24mm Composite Model Rocket Motor F44-8 2 pack 64404 Economax Almost 3x the thrust for the same price as an Estes E16 Put a bolt of lightning in your rocket! Includes 2 motors and 2 starters Total Impulse 41.41 N-s Burn Time: 0.9 sec Motor weight 48 grams 8 Second ejection delay Made in USA Recommended for ages 16 and up, Adult Supervision required for those under 16 years of age.