This is the 1/2A3-4T Mini Model Rocket Engines/Motors from Estes.
Suitable for Ages 10 & Older with Adult Supervision for Those Under 12.
Four 1/2A3-4T Engines
Four Igniter Plugs
Single stage engine
Mini engine designed for flights in lightweight rockets
Engines tested and certified by the NAR
Easy to use and comes with clear instructions
Available in blister pack package
Length: 1.75" (4.4cm)
Diameter: .5" (13mm)
Adult Supervision for Children Under 12