This is the F20-7W 29mm x 83mm Single Use Econojet Model Rocket Motor from AeroTech Consumer Aerospace. FEATURES: White Lightning - A brilliant white flame, dense bright white exhaust and a throaty roar are the hallmarks of this popular popular propellant Looks and sounds like actual sounding rockets and launch vehicles Instruction sheet included INCLUDES: Two F20-7W 29mm x 83mm Single Use Econojet Model Rocket Motor SPECS: Propellant type- White Lightning Dimensions: 1.125" x 3.283" (29mm x 83mm) Motor weight- 2.8 oz. (80g) Propellant weight - 1.1oz. (30g) Maximum recommended lift-off weight: 16oz. (454g) tlh 2/25/11