CNC process makes it have strong rigidity and high hardness. The mud trough design makes it reduce drag and reduce friction between the chain and the chainring.Exquisite and professional workmanship makes it very strong and durable. Anodized hardening treatment makes it have high texture and not easy to fade.Made of aluminum alloy material, it is very durable to use.The offset of this product is 0.3cm.It is suitable for mountain bike, road bike, cycling, bicycle and so on.Item Name: Bike DiscMaterial: Aluminum AlloyFeatures: Low Resistance, Strong Rigidity, High TextureSize Details: The offset: 0.3cm/0.12" (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 Disc