The Bilstein B6 11-17 BMW X3 / 15-17 BMW X4 Rear Monotube Shock Absorber is a high-performance suspension component designed to provide superior handling and ride comfort. It features a single-tube design with a gas-pressure system that helps to reduce friction and improve responsiveness. The shock absorber is constructed from high-quality, corrosion-resistant materials for long-term durability and is adjustable for a custom fit. It is designed to provide enhanced stability and control, allowing for better cornering and improved overall performance.