Rear Black Hart Drilled Slotted Brake Rotors and Ceramic Pads CL550,S400,S550 Black Hart Cross-Drilled Slotted Rotors and Ceramic Pads - Rear Cross Drilled for Air Ventilation and Fast Heat Dissapation Precision Slots to Improve Stopping power Advanced Ceramic Formulated Pads for Low Dust and Low Noise Ready to Install; Direct Bolt on; No Modication Needed