Features1Metal disc brake with great wear resistance for long time use. 2Still keep great braking force with little mud and dust on it after long time use. 3Adjusted brake compatible with kinds of bike like MTB bike, road bike and so on. 4Ball driven disc brake increase the stability of use. 5A great choice of bike refit parts.SpecificationMetal construction make the brakes with great resistance, do not worry about the braking force with little mud and dust on it after long time use but you are supposed to have it cleaned after some time to keep better performance.Features:Metal disc brake with great wear resistance for long time use.Still keep great braking force with little mud and dust on it after long time use.Adjusted brake compatible with kinds of bike like MTB bike, road bike and so on.Ball driven disc brake increase the stability of use.A great choice of bike refit parts.Specification:Material: Aluminum alloySize: 7.5 * 5cm / 3.0 * 2.0inWeight: F188g-6.6oz / R190g-6.7ozPackage weight: 382g / 13.5ozPackage size: 11 * 11 * 5cm / 4.3 * 4.3 * 2.0inPackage list:1 * Front Disc Brake1 * Rear Disc BrakePackage List1 * Front Disc Brake1 * Rear Disc Brake