MASTER AIRSCREW ELECTRIC PROP 6.5 X 4Electric Only Series Electric Only Series is dedicated exclusively to electric motor r/c airplanes and multi rotors. Features wide, thin under-cambered blades for optimum lift, flight duration and power draw. Tractor and pusher props available for twin engine airplanes. Made of Glass Fiber Reinforced Composite. Propeller diameter 6.5" / 165mm Propeller pitch 4" / 102mm Hub thickness 3/8" / 9.5mm Shaft diameter 1/4" / 6.35mm ** Propeller Weight 0.21oz / 6g Direction of rotation Normal / Tractor Material Glass Fiber R Composite Color Black