SSE 2 Pairs 9450 Self-tightening Carbon Fiber Propeller Blades for DJI Phantom 1, Phantom 2, and Phantom 3 Series Quadcopters 9450 Self-tightening Propellers (with a composite hub) Fits all DJI Phantom 2 & Phantom 3 series quadcopters 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 increasing flying efficiency No tools required. Self-tightening design, simply rotate the propellers by hand to attach or detach Includes two pairs of propellers: 2 clockwise and 2 counter-clockwise propellers