This is a replacement XRAY Ventilated Brake Disc, and is intended for use with the XRAY RX8. This CNC-machined 1-piece brake disk features a deep ventilation groove that helps to dissipate heat from both sides of the disk, while strategically-placed ventilation holes ensure minimal brake pad wear. This brake disk has been manufactured from special steel and additionally heat-treated for maximum lifespan, then precision flat-ground for maximum braking efficiency and super-smooth braking action.