Every spring produced by H&R comes from the H&R ISO 9001 certified engineering and manufacturing facility in Germany. All H&R springs are produced from a special 54SiCr6 spring steel, which has strength rated at 290,000 psi resulting in unrivaled tensile strength and resiliency.Only from H&R, H&R Super Sport Springs have all the features of Sport Springs, plus additional lowering—great for the seasoned enthusiast looking for a little more. These high tech progressive springs retain superior ride comfort. The handling of your vehicle will be improved with a lower center of gravity. H&R Super Sport Springs give your vehicle the best-looking performance stance.*Features** Lowers 1.75 - 2.3 inches on average* Provides superior ride and maximum lowering