0-ESTE4617 Estes Motor Set Proto-X/Syncro (4) <p><font color="#00ff66" size="2" face="Arial, Helvetica, sans-serif">This is the Motor Set for the Estes Proto-X Nano Quadcopter. Replaces worn Proto-X motors. Wire lead color indicates direction of rotation-motors with red and blue leads operate clockwise, and motors with black and white leads operate counter-clockwise. Two clockwise rotation Motors and two counterclockwise rotation Motors included.</font></p>