MASTER AIRSCREW 3 BLADE 15 X 7 PROP3-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 15" / 381mm Propeller pitch 7" / 178mm Hub thickness 3/4" / 19.1mm Shaft diameter 5/16" / 7.94mm ** Propeller Weight 3.35oz / 95g Direction of rotation Normal / Tractor Material Glass Fiber R Composite Color Black