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HIGH QUALITY RESIN AND SEMI METAL MATERIALS: This bicycle break pad is made of qualified resin and semi metal material, lightweight, compact and durable to use. GOOD PERFORMANCE: It will need less time for mechanical running in, prevent heat accumulation. Great parts and accessories for bicycle, comes with spring clips for installation. GREAT ACCESSORY: Have direct and sensitive reaction, suitable for normal ride. Suitable for BB7, J3, J5, J7 brake or other brakes of same shape and size.