Jrelecs Two Pairs 5030 53 Carbon Fiber 3-blade Propeller Prop CW/CCW for QAV250/280 H250 Multirotor Quadcopter - Black 5*3'' Carbon Fiber 3-Blade Propeller Suit For: 4-Axis RC Helicopter Easy to install. High quality and durable in use. Especially improves the air-powered efficiency and aerofoil stability