PROMAX Phantom 2 and 3 Professional Set of Four 9-inch 9450 Carbon Fiber Self-Tightening Reinforced Strong Propellers! Self-tightening Propellers (with a composite hub) A set of two propellers. Includes one clockwise replacement propeller and one counter-clockwise replacement propeller Compatible with Phantom 3/Phantom 2 series or Flame Wheel series platforms with the E310/E305/E300 tuned propulsion systems They can be used with Composite Hub so they can be used on the Phantom 3! Carbon Fiber Self-locking tension enhanced propeller for DJI Quadcopter