Made of Aluminum alloy and steel, and sturdy. Strong and well built bike rack for carrying lots of weight. Fit almost bikes, Easy to use and easy to install. The maximum width of the seat is about 13 cm, and the maximum length is about 34.6 cm. Height: The height from the seat to the leg screw holes is about 27cm. Rack mounts to back of your bicycle to help you easily transport . aluminum alloy rack can carry up to 80KG. colour: black Material: aluminum alloy + steel Package Contents: 1 x Bike Rear Racks Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.