When it comes to coil springs for Coil-overs, Ridetech supplies Hyperco Hypercoils exclusively. Hypercoil coil springs are manufactured from high tensile chrome silicon steel - the highest grade spring material available. The high tensile steel wire used in Hypercoils is lighter and allows additional travel before reaching coil-bind. Hyperco's advanced engineering produces coil springs that achieve the same length and rate W/ fewer coils than other brands. In many cases, Hypercoils use three less coils and smaller diameter wire (.480 inch vs. .510 inch). This allows for an additional compression of the spring which equates to better travel. During the manufacturing process, Hypercoils undergo two separate Magnaflux inspections to ensure that all coil springs are free from surface imperfections that might lead to early failure. Hyperco employs a unique combination of state-of-the-art CNC equipment along W/ small town craftsmanship to produce the finest coil springs available anywhere in the world. 8 Inch Free Length 600 LBS Inch 2.5 Inch ID More usable deflection Less weight than standard suspension springs 2 percent rate linearity tolerance More resistant to bowing than competitor's springs Maintain free length and rate throughout a near infinite operational life Designed to fit all standard hardware Sold individually