The EBC 06-09 BMW Z4 3.0 Si GD Sport Front Rotors are high-performance brake rotors designed for the BMW Z4 3.0 Si. These rotors are constructed with a special blend of iron that provides superior strength and durability. The rotor design is also optimized to reduce stopping distances and improve overall braking performance. The rotors feature a unique dimple drilled and slotted design that helps to reduce brake fade and improve cooling efficiency. The rotors are also coated with a special black zinc finish that helps to protect against corrosion and increase the life of the rotors.