This is the D12-0 Standard Model Rocket Engines/Motors from Estes.
Suitable for Ages 10 & Older with Adult Supervision for Those Under 12.
Three D12-0 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 14 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