This is the C6-7 Standard Model Rocket Engines/Motors from Estes. Suitable for Ages 10 & Older with Adult Supervision for Those Under 12.
Upper stage engine
Can also be used as a single stage engine in lightweight rockets
Engines tested and certified by the NAR
Easy to use and comes with clear instructions
Length: 2.75" (7cm)
Diameter: .69" (18mm)