The X4 is the smaller version of the Highwind X5 designed for 4" props. Motor to motor distance is 180mm. It's 4mm thick one piece main body accomodates any 22xx size motor but is optimally powered by the RG2205 2700kv motors. The high kv power system combined with the lightweight frame (61g) makes for an extremely fast and manouverable racing machine.
Comes with all hardware as seen in the photos (spacers and screws for the frame and control board mount)