Carbon wheels V brake pads Size Material: Ceramic Components: Tablets Length: 2.13 inch (54 mm) Wide: 0.5 inch (13 mm) Slot width: 0.37 inch (9.3 mm) Thickness: 0.4 inch (10 mm) Weight: around14g +/- pair Brake System: V Brake (Brake to Disc Friction) Model,can be used on either front or rear brakes. Brake pads Use: Road bikes, Kids ..