The Bilstein B6 2006 BMW Z4 M Roadster Rear 36mm Monotube Shock Absorber is a high performance shock absorber designed to provide maximum stability and control for the BMW Z4 M Roadster. The 36mm monotube design provides superior damping response and improved handling. The shock absorber is constructed from high-quality materials for long-lasting performance and durability. It is also corrosion-resistant and designed to provide superior ride comfort. This shock absorber is an ideal choice for those looking to upgrade their vehicle's suspension system.