【Premium Material】- This bicycle disc brake rotor is made of high quality stainless steel and 7075AL material, which is sturdy and durable. Not easy to break, has reliable quality and ensures high strength for long term use 【Cooling Function】- The bike disc brake rotor has cooling function, great dry and moist function, which provides good protection for your bike 【Product Specification】- Material: 7075AL + stainless steel; color: red. Optional size: approx. 140mm / 5.5 in; approx. 160mm / 6.3in; approx. 180mm / 7.1 in; approx. 203mm / 7.9in 【4 Sizes】- The bicycle disc brake cooling floating rotor has 4 different sizes for you to choose (140mm, 160mm, 180mm, 203mm) , which can meet your different needs 【Comvenient to Use】- The bike disc brake cooling floating rotor is easy to install, which is very convenient to use