The Bilstein B4 Series 19-029177 is a high-quality gas-pressure twin-tube shock absorber designed for rear axle installation. Engineered to meet or exceed original equipment standards, it provides the perfect restoration of the original handling characteristics and ride comfort of your vehicle. This shock absorber offers constant damping power under any load and high power reserves for maximum safety. Component List: 1x Shock Absorber Bilstein B4 19-029177 (Single Unit). Note: For best performance and safety, it is highly recommended to replace shock absorbers in pairs.