GoolRC 9" Carbon Fiber Propeller Prop 9443 for DJI Phantom 2 Set of 4 Pcs Self-tightening Carbon Fiber Balanced Propellers( self design) for DJI Phantom 1 / 2 / Vision Quadcopter. Size 9.4x4.3, The same specs as the factory props of the newest Phantom 2 Vision. These high quality carbon fiber propellers work much better than the stock propeller, the stock props or non-carbon fiber props are soft and less efficient, carbon fiber props are lighter and much stronger therefore increase the flying efficiency hey are specifically made for Phantom 2 and Vision. All parameters are the same as the factory Phantom 2 / Vision props. Simply put them on and fly.