MASTER AIRSCREW ELECTRIC PROP 11 X 7Electric 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 11" / 279mm Propeller pitch 7" / 178mm Hub thickness 1/2" / 12.7mm Shaft diameter 1/4" / 6.35mm ** Propeller Weight 0.76oz / 21.5g Direction of rotation Normal / Tractor Material Glass Fiber R Composite Color Black