This SHW 06-08 BMW Z4 3.2L Left Rear Cross-Drilled Lightweight Brake Rotor (34212282303) is a direct replacement for the original brake rotor. It is manufactured from high-grade, lightweight cast iron for superior strength and durability. The rotor features a cross-drilled design that helps to improve heat dissipation and reduce brake fade. It is also precision balanced for smooth and quiet operation. This brake rotor is designed to meet or exceed OEM specifications and is an ideal replacement for worn or damaged brake rotors.