The EBC 99-01 BMW 323 2.5 (E46) BSD Rear Rotors are a high-performance replacement brake rotor set designed to fit BMW 323 2.5 (E46) model vehicles from 1999-2001. These rotors feature a unique BSD (Brake Specific Design) that is designed to increase braking torque and reduce brake fade. The rotors are made from a high-grade carbon steel that is heat-treated for maximum durability and longevity. The rotors are also precision machined for a precise fit and optimal performance.