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Hyperco combines the latest technology with old-fashioned craftmanship to produce a coil spring recognized by top competitors worldwide. At first glance all coil springs look alike, but there are major differences in materials, inspection processes and tolerances. All of these things impact performance. All Hypercoils are dark blue powder coated and imprinted with the spring rate. 12" Springs fit 5" single and double adjustable shocks. Sold Each