9'' 9450 Upgrade Replacement Carbon Fiber Props Self-tightening Propellers 4 Pcs (2 Ccw + 2 Cw) for DJI Phantom 2, Phantom 2 Vision, Phantom 2 Vision+ Quadcopter - Purple + Blue Model: 9450. Compatible with DJI Phantom 2 / Phantom 2 Vision / Phantom 2 Vision+ quadcopter Made of lightweight carbon fiber. Length: 9.4''; Weight(g): Approx 26.6/2pcs; Easy to install 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 they increase the flying efficiency Self-tightening design avoids prop becoming loose during operation and potentially flying away Package included: CCW Self-tightening Propeller x 2; CW Self-tightening Propeller x 2; Free touch screen stylus pen is included (Random color shipped)