MASTER AIRSCREW 8 X 5 PROP GF SERIESPerformance Propellers for Model Airplanes - GF Series GF Series is specially designed for sport flying and high performance model R/C airplanes with electric motors or glow engines. Made of Glass Fiber Reinforced Composite for strength & durability. Propeller diameter 8" / 203mm Propeller pitch 5" / 127mm Hub thickness 3/8" / 9.5mm Shaft diameter 3/16" - 1/4" / 4.76mm - 6.35mm * Propeller Weight 0.39oz / 11.1g Direction of rotation Normal / Tractor Material Glass Fiber R Composite Color Black