GoolRC 2 Pairs 6030 6*3 Carbon Fiber 3-Blade Propeller Prop CW/CCW for QAV250/280 H250 Multirotor Quadcopter aterial: Carbon Fiber Length: 6.0 inch Screw pitch: 3.0 Center hole diameter: 5mm Suit for: QAV250/280 H250 Multirotor Quadcopter.