Drilled and Slotted Rear Brake Rotor Set (WHPN1-31121) by R1 Concepts®. Engineered for drivers who demand both performance and visual appeal, this drilled and slotted rotor set from R1 Concepts delivers consistent stopping power under high-stress conditions. The precision-machined holes and directional slots are designed to improve brake response, reduce fade, and maintain clean pad surfaces for reliable everyday and performance use.