The Bilstein B3 96-02 BMW 5 Series Replacement Rear Coil Spring is a high-performance, direct-fit replacement spring designed to restore the original ride quality of your BMW 5 Series. It is constructed from high-strength steel and is engineered to meet or exceed OE specifications for a reliable, long-lasting performance. The spring features a progressive rate design that delivers a comfortable ride with improved control and stability. The spring is corrosion-resistant and is backed by Bilstein's limited lifetime warranty for added peace of mind.