The Bilstein B6 1979 BMW 528i Base Rear 46mm Monotube Shock Absorber is a high-performance suspension upgrade designed to provide superior handling and control. It features a 46mm monotube design that is resistant to aeration and foaming, allowing for consistent damping performance. This shock absorber also features a self-adjusting deflective disc valving that provides a comfortable ride even in the most extreme driving conditions. Additionally, the Bilstein B6 1979 BMW 528i Base Rear 46mm Monotube Shock Absorber is constructed from high-strength steel for maximum durability and reliability.