The Eibach Pro-Kit Performance Springs (Set of 4) for 14-16 BMW X5 / 14-16 BMW X6 are designed to improve the handling and performance of your vehicle. The progressive spring design and construction offers improved cornering grip and a more responsive, sporty feel. The Pro-Kit will reduce body roll, squat during acceleration, and excessive nose-dive under braking. The springs are made from a special alloy steel material that is heat treated and shot-peened for superior performance and durability. These springs are designed to provide a lower center of gravity, reducing squat during acceleration, body roll in corners and excessive nose-dive under braking. The Pro-Kit also helps to improve the overall look of your vehicle by lowering it an average of 1.0 - 1.5 inches.