** There is a new version of F1506 with different material (we named it V2). Please make sure your motors are V2 new version if you are buying the motor (for replacement purpose) on this page. The V2 F1506 has stronger magnets than previous version so it cannot be used together with the previous version on the same Quad. And it (V2) cannot be distinguished from the box and motor. So if you are not sure, please get a full new set instead. All F1506 shipped from us after 23th Jan 2018 are V2 version.