The Eibach ERS Linear Tender Spring maintains coilover tension with a 50 lbs/in rate. Measuring 3.50 inches long with a 2.50-inch inner diameter, this single high-tensile steel spring prevents spring dislodgement in universal race setups. Ideal for track or street, it ensures smooth suspension response. Professional installation and tuning are required. Powder-coated for durability, it includes a limited lifetime manufacturer warranty.