eLINE™ Drilled and Slotted 1-Piece Rear Driver Side Brake Rotor (ECB-21002L) by R1 Concepts®. Quantity: 1 Per Pack. eLINE Series Brake Rotors provide high-quality stopping power at a low and affordable cost. With R1 state-of-the-art technology, you don’t need to choose between performance and budget: it’s all there in a single package. Your brake rotors will last longer, cost you less, and ensure your vehicle’s safety for thousands of miles to come. Cross-Drilled and Diamond-Slotted rotors provide the maximum benefits in stopping power, durability, and performance. Brake Rotor Coating is designed to disappear in the area that the brake pads contact the rotor.