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.
This is the E16-6 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