The Bilstein B6 2006 BMW X5 4.4i Formula 1 Rear 46mm Monotube Shock Absorber is designed to provide superior performance and handling for your vehicle. This shock absorber features a 46mm monotube design that is specifically tuned for the BMW X5 4.4i. It has a gas-filled design that provides a more consistent damping force, and it is corrosion resistant for long-term durability. The shock absorber also features a self-adjusting deflective disc valve that provides a smooth, comfortable ride. This shock absorber is a great choice for those looking to upgrade their vehicle's suspension for improved performance and handling.