This kit is designed specifically for BMW models E90, E91, E92, and E93 and includes four essential components for maintaining and improving the control and handling of a car. The kit contains four control arms, which are crucial for connecting the suspension system to the chassis and allowing for smooth steering and stability. It also includes four control arm bushings, which help to absorb shock and reduce vibrations for a more comfortable ride. The kit also features four ball joints, which are essential for allowing the wheels to move up and down and maintain proper alignment. Lastly, the kit includes four tie rod assemblies, which are responsible for connecting the steering mechanism to the wheels and allowing for precise steering control. This comprehensive kit provides all the necessary components to ensure optimal performance and handling for a BMW car.