us ，  towillin 5 .<br /><br />package include:<br />1 x 6s 4108/380 kv brushless motors<br />3 x m3x6mm cup head screws<br />2 x m3x8mm round head screw<br />1 x metal rotor installing piece<br /><br />features:<br />-designed for quad-copters and hex-cop