8mm shaft brushless motor for 1 / 5 RC model car T-number can be combined arbitrarily. Each gear is equipped with a machine screw and packaged with transparent belt, Gear Tooth: 13T/14T/15T/16T/17T/18T/19T/20T/21T/22T/23T/24T/25T/26T/27T/28T/29T/30T/...