The Bilstein B4 2012 BMW Z4 sDrive28i Front Right Suspension Strut Assembly is a high-performance suspension system designed to provide superior handling and ride comfort for your BMW Z4. This assembly includes a gas pressurized monotube shock absorber, a precision-engineered steel strut, and a dust boot. This strut assembly is designed to reduce body roll, improve cornering stability, and deliver a smooth ride. It is also corrosion-resistant and features a lifetime limited warranty.