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.The name says it all. When the need for uncompromising handling performance becomes your priority, it's time to fit your car with H&R Race Springs. H&R Race Springs will provide your vehicle with over-the-top race-ready performance and appearance. Like all other H&R lowering springs, H&R Race Springs are crafted from a special 54SiCr6 spring steel. A camber adjusting device like H&R 'Triple C' Camber Adjustment Bolts may also be required in order to remove excess negative camber, ensure longer tire life, and to obtain the highest performance from your vehicle.