The Bilstein B4 2011 BMW X5 xDrive35i Rear Left Shock Absorber is a direct replacement shock absorber designed for the 2011 BMW X5 xDrive35i. It is a gas-pressure shock absorber that provides improved handling and driving comfort with increased stability. The shock absorber is built with a monotube design and features Bilstein's patented digressive valving technology, which allows for precise damping control under all driving conditions. It is also corrosion-resistant and has a durable powder-coated finish for a long service life.