Tru-Cast Technology Drilled & Slotted Performance Rotors. Power Stop drilled and slotted rotors give you the advantages of both drilled holes for cooling and slots to sweep away gas and dust. Power Stop rotors use only the finest blanks and feature G3000 grade castings from the best foundries. All drilled and slotted rotors (except for hub rotor assemblies) are silver zinc plated to resist rust. The drilled and slotted design is our most popular performance rotor for street and day track applications. Sold as a 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