Motor Material: The brushless gear hub DC motor adopts aluminum alloy hub, which can effectively improve the edge of the hub, which is light and high end, comfortable, and has strong bearing capacity, realizes noise free operation, and allows you to fully enjoy the riding pleasure. Controller Material: The controller shell is made of premium metal, with slot design, good heat dissipation, to avoid thermal overload of the internal circuit. Meter Material: The meter is made of premium ABS plastic material, which is light in weight, strong and durable, fine workmanship, good toughness, ...