The EBC 08-11 Audi S4 BSD Rear Rotors are a set of high-performance brake rotors designed to provide superior stopping power for the 2008-2011 Audi S4. They feature a black anodized finish for superior corrosion resistance and are made from a special blend of iron and carbon that provides superior heat dissipation. They also feature a unique curved vane design for improved airflow, which helps to reduce brake fade and increase stopping power. The rotors are designed to be a direct replacement for the original Audi S4 rotors and are backed by a limited lifetime warranty.