The Black Diamond Combi (or Combination) discs feature 12 curved radial grooves on each disc face with machined holes inbetween each groove for excellent heat dissipation and cooling. This combination of machined surfaces also helps to de-glaze the pads, offering greater friction under hard braking condition and making them less likely to fade. The result is better pedal feel and improved brake response.The unique compound and heat treatment after machining combine to provide awesome braking performance that will improve stopping power and give longer lasting durability. They also look great behind wheels !An award winning disc and favourite amongst car tuners the world over.Supplied as a pair.Please Note -The coating on these discs will wear off the surface swept by the pads.