Brembo 09.7812.21 UV Coated Front Disc Brake Rotor Environmentally friendly, solvent free UV coating offers superior protection of the disc, including braking plate surfaces; includes new intelligent marking location for immediate control of the minimum thickness High Carbon cast iron minimizes noise and vibration and provides maximum performance and enhanced driving comfort Pillar Venting Technology improves cooling capacity and increases disc strength by over 40 percent Outside Diameter (mm) 326; Nominal TH (mm) 30