This is the C11-0 Standard Model Rocket Engines/Motors from Estes.
Suitable for Ages 10 & Older with Adult Supervision for Those Under 12.
Three C11-0 Engines
Four Igniter Plugs
Booster stage engine and has to be used with a standard engine
Engine is for flights in rockets weighing less than 6 ounces,
including the engines
Engines tested and certified by the NAR
Easy to use and comes with clear instructions
Length: 2.75" (7cm)
Diameter: .95" (24mm)
Adult Supervision for Children Under 12