The Eibach ERS Coil-Over Spring optimizes suspension performance with a 140 N/mm rate. Measuring 140mm (5.51 inches) long with a 60mm inner diameter, this single high-tensile steel spring is designed for universal coilover systems. Ideal for race or street setups, it ensures consistent response under load. Professional installation and tuning are required. Powder-coated for durability, it includes a limited lifetime manufacturer warranty.