StopTech Sport Rotors are 1-piece direct replacement brake discs for factory brake systems and stock calipers. This is the Front Left Cross-Drilled Sport Rotor (128.40046L) designed to improve cooling and braking performance. Features include: cooling vanes for heat dissipation, cross-drilling for debris bypass, and a durable e-coating for corrosion resistance. Note: This part is a single rotor. For a full front set, please order 128.40046L (Left) and 128.40046R (Right).