The Bilstein B4 2005 BMW 120i Base Hatchback Rear Shock Absorber is a high-performance, monotube shock absorber designed for superior handling and ride quality. It features a gas-pressure design that provides consistent damping and a smooth, controlled ride. The shock absorber is constructed from high-quality materials and is corrosion-resistant for long-lasting durability. It is designed to provide superior handling and stability, even in the most extreme driving conditions.