This is a pair of Great Planes ElectriFly PowerFlow 10x4.5 Propellers. FEATURES: Constructed of plastic, Black in color Blade ends are turned back to reduce drag and increase thrust by improving the blade lift over drag curve INCLUDES: Two Great Planes ElectriFly PowerFlow 10x4.5 Propellers with warning sheet SPECS: Length: 10" (254mm) Pitch: 4.5 Hole Diameter: 3/16" (5mm) REQUIRES: Installing on motor shaft COMMENTS: For electric flight ONLY, do not use with nitro powered aircraft. jxs 6/07/06 ir/jxs