The Koni Sport (Yellow) Shock 03-09 BMW Z4 - Left Front is a high-performance suspension system designed to improve the handling and performance of the BMW Z4. It features a monotube design, which is designed to provide increased damping sensitivity and control. The shock is adjustable, allowing for fine-tuning of the suspension settings. The shock is made from durable materials and is finished in a bright yellow color. It is designed to provide a smooth ride and improved handling for the BMW Z4.