The Bilstein B4 OE Replacement 11-15 BMW X3 xDrive Rear Twintube Shock Absorber is a direct replacement for the original equipment shock absorber in the 11-15 BMW X3 xDrive. This shock absorber is designed to provide superior handling and stability, as well as improved ride comfort and control. It features a monotube design with a self-adjusting deflective disc valve that provides maximum damping response. The shock absorber is constructed from high-quality materials that are corrosion-resistant for long-lasting performance.