The Parrot Replacement Propeller Set for AR.Drone and AR.Drone 2.0 features a complete set of four replacement propellers in black. Included are two clockwise and two counter-clockwise (ant-clockwise) rotating blades. The blades marked "C" will attach to motor 1 and motor 3 while the blades marked "A" will attach to motor 2 and motor 4. In addition, eight circlips are provided for mounting. To aid in the attachment of the circlip, a circlip tool is available from Parrot.