Due to the process of using CNC carving and milling and anode oxidation, our products have bright colors and clear printing. It is not easy to deform and oxidize, and it can be used for a long time. There is no doubt that our products can be used for a long time because of its high hardness, and our products can be freely expanded without cracking or scratching because there is room for expansion. It uses a unique heat dissipation design to prevent heating. It is made of aluminum alloy and stainless steel. It is durable and can be selected with four sizes. Your product is suitable for bicycles. 14 cm or 5.51 inches (approximately) diameter 160mm: 16 cm or 6.3 inches (about) diameter 180mm: 18 cm or 7.09 inches (approximately) diameter 203 mm: 20.3cm or 7.99 (approximately) annotation settings may be different from. The picture is slightly different. Please allow small size differences caused by different manual measurements. Packaging includes: 6 x screws 1 x bicycle floating tray