This Product Is Made Of Square Aluminum alloy Materials And Processed By Cnc Engraving. It Has Higher Precision, Strength And Stability Than Mold Products. It Is An Excellent Accessory compatible with Upgrading Bicycles.Using High-Quality Rubber, The Slightly Curved Design Will Not Damage The Wheels And Provide Braking Without Harsh Noise. Brakes Are More SensitiveThe Brake Pads Are Made Of Wear-Resistant Rubber And Metal, And The Unique Sand Guide Groove Effectively Prevents Sandstone From Damaging The Rim. With Excellent Anti-Skid Percompatible withmance, It Can Exert Excellent Braking Effect Even In Rainy Days.Tips: The Brake Pads Of This Product Are Used compatible with Aluminum Rims And Steel Rims. Try To Use Them As Little As Possible On Carbon Fiber Rims, Because This Is Not a Professional Brake Pad compatible with Carbon Rims. If It Is a Carbon Fiber Rim, It Is Recommended To Purchase a Special Brake. Pads Can Be Used With Aluminum alloy brake Shoes shell .colour: redMaterial: Aluminum alloy + stainless steelSize: 55.4x24x24.3mmPackage Contents:1 pair x Bike Caliper BrakeOnly the above package content, other products are not included.Note: Light shooting 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.