Crazepony 12pcs 1806 Motor Guard Protector Caps for FPV QAV250 Racing Drone QuadcopterRed Green Black To protect the motors from Dirt and Impacts. It can fit any FPV racer which has arms with flat motor mounting surface. Any motor with outer diameter less than 18 can be used on this protective guard, but we suggest 1800' s series motor such as PM1806,EMAX MT1806 etc considering the size matching. Quadcopter requires 4pcs, while hexacopter requires 6pcs. More RC racing Quad-copter product is provided by Crazepony on Amazon.Bring your eyes into the sky and racing like a free bird, enjoy the ultimate first person view experience.