MASTER AIRSCREW 3 BLADE 12 X 8 PROP3-Blade Propellers for Model R/C Airplanes FB - factory balanced propeller - for more information click here 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 12" / 305mm Propeller pitch 8" / 203mm Hub thickness 9/16" / 14.3mm Shaft diameter 1/4" / 6.35mm ** Propeller Weight 1.69oz / 47.9g Direction of rotation Normal / Tractor Material Glass Fiber R Composite Color Black