The EBC 01-02 BMW 325Xi 2.5 (E46) BSD Rear Rotors are a set of high-performance brake rotors designed to provide superior stopping power and durability for BMW's E46 model. The rotors feature a special BSD (Bi-Symmetric Design) which maximizes braking power and reduces vibration and noise. They are made from high-grade cast iron with an advanced surface treatment for improved thermal stability and resistance to corrosion. The rotors are also designed to be lightweight and have a wide range of fitment compatibility, making them ideal for a variety of applications.