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