I use the propellers for my Hubsan H107 X4 and am completely satisfied. As I am now mostly go without protector with the drone, take the small propeller here and there in the floor, wall or ceiling Contact minor damage. These forgive Although very long, after some time, the wear become noticeable. With the replacement propellers that are really cheap, I now have a trivalent, stable exchange product that replaces the consumable parts cost. Would not hesitate to strike here again.