The Genuine BMW 4-Piece Control Arm Kit (E83 X3) - 459402 is a comprehensive kit of products designed specifically for the E83 X3 model of BMW cars. It includes four essential components: control arms, ball joints, bushings, and mounting hardware. These parts are essential for the proper functioning and stability of the car's suspension system, ensuring a smooth and safe driving experience. The control arms are responsible for connecting the suspension system to the chassis of the car, while the ball joints allow for smooth movement and rotation of the control arms. The bushings provide cushioning and absorb shock, while the mounting hardware ensures that all the components are securely attached to the car. This kit is a genuine BMW product, designed and manufactured to the highest standards of quality and compatibility with the E83 X3 model. It is a must-have for any BMW owner looking to maintain the performance and reliability of their vehicle.