This is the E20-4W 24mm x 70mm Ammonium Perchlorate Composite Propellant Model Rocket Motor from AeroTech Consumer Aerospace. FEATURES: White Propellant- 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 E20-4W 24mm x 70mm Single Use Composite Model Rocket Motor SPECS: Propellant type- White Lightning Outer diameter: .938" (24mm) Length: 2.75" (70mm) Motor weight- 1.76 oz. (50g) Propellant weight - .57oz. (16.2g) tlh 2/25/11