StopTech Sport Rotors are 1-piece direct replacement brake discs for your factory brake system and stock calipers. They offer improved stopping power and cooling compared to standard rotors. This specific part (128.61087R) is a Cross-Drilled Sport Rotor for the Rear Right position. Features include: E-Coated finish for high corrosion resistance, directional drill patterns for better heat dissipation, and improved wet weather performance. Note: This is a single rotor (1 unit). Matching Left Rear Rotor: 128.61087L.