This is the Great Planes PowerFlow 11x8.5 Electric Propeller. FEATURES: Constructed of plastic, Black in color INCLUDES: One Great Planes PowerFlow 11x8.5 Electriv Propeller SPECS: Length: 11" (254mm) Pitch: 8.5 Hole Diameter: 1/4" (5.5mm) REQUIRES: Installing on motor shaft COMMENTS: For electric flight ONLY, do not use with nitro powered aircraft. cnh 7/29/08 ir/jxs