Undoubtedly, our product can be used for a long time because of its high hardness while our product can expand freely without being cracked or scratched because there are the space for expansion is reserved. It adopts a unique heat dissipation design to prevent over heating.With excellent corrosion resistance, good mechanical properties and anodic reaction, it has a long service life. It also has the characteristics of wear resistance, high temperature resistance and not easy to deformation.It is made from aluminum alloy and stainless steel, is durable to use.There are three sizes of the product to choose from.160MM is commonly used for mountain bikes and 140MM is commonly used for road bikes.Item Name: Bike Floating DiscMaterial: Stainless Steel,Aluminum AlloyFeatures: Fine Workmanship, Rust-proof, Vibrant ColorSize Details: Size: 14cm x 20.3cm or 5.51" x 7.99" (Approx.)Size: 16cm x 20.3cm or 6.3" x 7.99" (Approx.)Size: 18cm x 20.3cm or 7.09" x 7.99" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Bike Floating Disc