This is a pair of Great Planes ElectriFly PowerFlow Slo-Flyer 8x3.5 Propellers. FEATURES: Constructed of plastic, Black in color Blade ends are swept back to reduce drag and increase thrust by improving the blade lift over drag curve INCLUDES: Two Great Planes ElectriFly PowerFlow 8x3.5 Propellers with warning sheet SPECS: Length: 8" (228.6mm) Pitch: 3.5 Hole Diameter: 3mm REQUIRES: Installing on motor shaft COMMENTS: For electric flight ONLY, do not use with nitro powered aircraft jxs 01/03/10 ir/jxs