The Bilstein B4 01-06 BMW M3 Front Left Twintube Shock Absorber is a high-performance suspension component designed to provide superior handling and stability for your BMW M3. The shock absorber features a twintube design with a monotube inner tube for improved damping control and increased fade resistance. It is constructed from a high-quality steel body with a corrosion-resistant finish for long-lasting performance and durability. The shock absorber also includes a dust boot and a rubber bellow to protect it from dirt and debris. This product is designed to provide a comfortable ride and improved handling for your BMW M3.