These are probably the best motors on the market for the smaller quadcopter frames like the 130mm frames. These motors are crazy strong for their size and will take up to the 4S batteries. When building your quadcopter, you will notice that the EMAX motors are built with high quality silicone wires coming off the motors that you would solder to your ESCs. Build your mini quadcopter with confidence using these motors. You will NOT be disappointed! I put these on my Deformation 130mm frame and LOVE them!