H&R VTF kits are designed to work with your vehicles original electronic shocks. Specific rate springs provide superb ride quality and comfort, while reducing body roll, offering more balance and control to your ride. H&R VTF packages are made with light weight, high tensile strength spring steel alloy, feature a limited lifetime warranty, and are T?V approved. The H&R philosophy is simple and effective: To manufacture the best suspension products, using only the highest grade materials, and then back all of our products with unparalleled customer service. This philosophy has made H&R what it is today - the industry leader in high performance, quality suspension components. Be it on the street or on the track, H&R has become synonymous with consistent, proven suspension performance and quality.