MASTER AIRSCREW 3 BLADE 16 X 8 PROP 3-Blade Propellers for Model R/C Airplanes 3 blade model airplane propellers specially developed for the most demanding hobby professionals. Great performance and scale look both for electric motors and glow engines. Carefully crafted from Glass Fiber Reinforced Composite. Available in sizes 5" to 16". Propeller diameter 16" / 406mm Propeller pitch 8" / 203mm Hub thickness 11/16" / 17.5mm Shaft diameter 5/16" / 7.94mm ** Propeller Weight 3.84oz / 108.9g Direction of rotation Normal / Tractor Material Glass Fiber R Composite Color Black