MASTER AIRSCREW 8 X 4 SCIMITAR S2 SERIESFeatures a scimitar-shaped blade with swept tips and under-cambered blades. Provide great speed, thrust and noise suppression. Perfect for high performance models. Made of Glass Fiber Reinforced Composite. Available in sizes 6" to 16". Propeller diameter 8" / 203mm Propeller pitch 4" / 102mm 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