The Eibach ERS Linear Tender Spring optimizes coilover performance with a 250 lbs/in rate. Measuring 5 inches long with a 2.25-inch inner diameter, this single high-tensile steel spring maintains tension during extension 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.