Power Stop AR8123XPR Rear Evolution Drilled & Slotted Rotor Pair Gives you the advantages of both drilled holes for cooling and slots to sweep away gas and dust All drilled and slotted rotors (except for hub rotor assemblies) are silver zinc plated to help shield and resist rust during normal operation Beveled and precision drill holes help keep rotor temperatures down during extreme braking performance Rotors are reverse engineered from OEM samples Up to 180 degrees cooler