StopTech Slotted Sport Brake Rotor (Left Front). Part Number: 126.68001CSL. This is a single high-performance brake rotor featuring patented cryogenic treatment for improved durability and heat resistance. The CNC-machined slots help to evacuate gases and dust, ensuring consistent braking performance and preventing pad glazing. Black E-Coated finish provides superior corrosion resistance. Components: 1 x StopTech 126.68001CSL (Slotted & Cryo-Treated Rotor, Front Left).