StopTech Slotted Sport Cryo rotors are 1-piece direct replacement brake discs for your factory brake system. This 'CSL' part number signifies a Cryogenically treated, Slotted finish for the Front Left position. Cryogenic treatment permanently improves the service life of the rotor by strengthening the metallic grain structure. The slotted pattern aids in heat and gas dissipation while improving initial bite. Features include: Black E-Coated finish for corrosion resistance, CNC machined cooling vanes for heat management, and mill balancing for vibration-free performance. Package includes: 1 x Front Left Slotted Cryo Brake Rotor (P/N 126.44174CSL).