The EBC 01-03 BMW 525i 2.5 (E39) BSD Rear Rotors are a set of high-performance replacement rotors for BMW's E39 5-Series. These rotors are designed to provide superior braking performance, with a slotted and dimpled surface that helps to reduce brake fade and improve grip. They are made from a high-grade cast iron, and are coated with a protective layer of zinc for extra corrosion resistance. These rotors are an ideal choice for those looking for improved braking performance and reliability.