The Bilstein B4 2011 BMW Z4 sDrive30i Front Left Suspension Strut Assembly is a high-performance suspension component designed to improve the handling and stability of the BMW Z4 sDrive30i. It is made from a monotube design with a gas pressurized piston for superior damping and improved ride quality. The strut is constructed from a durable steel body and is corrosion-resistant for long-term use. It is specifically designed to fit the 2011 BMW Z4 sDrive30i and includes all necessary mounting hardware.