StopTech Sport Slotted Brake Rotors are premium replacement brake discs designed for high-performance driving. This specific model (126.47023SL) is a single Rear Left Slotted Rotor. Features include: 1. Power Slot technology for improved heat dissipation and gas venting. 2. E-Coating finish to prevent corrosion on non-friction surfaces. 3. Direct OEM replacement for Subaru WRX STi models with 5x114.3 hub bolt pattern. 4. Enhanced pedal feel and consistent braking performance in wet or dry conditions. This item is a single unit; for a complete rear set, please order the corresponding Right Side rotor (126.47023SR).