Single stage engines.
Rockets such as the "Gnome", "Mosquito" and "Mighty Mite" are launched with Mini engines.
INCLUDES: Four Estes 1/2A3-4T Model Rocket Mini Engines.
REQUIRES: Model Rocket
SPECS: Length: 1-3/4" (4.4cm)Diameter: 1/2" (1.3cm)
ROCKET MOTORS SHIP VIA USPS PARCEL POST ONLY!