Engineered for vehicles with higher loads and additional passengers with slightly more aggressive spring rate to maintain the balance you need at the limit. True Dual-Spring Set Up - Includes Springs Sliders Stop Rings and Setup instructions for easy installation. Engineered and Tested FOR Enthusiasts - BY Professionals for Maximum Performance on any Terrain. Race Proven Durability Quality and Repeatability you can rely on. Made By Eibach in the U.S.A.