The RSS line of performance coilovers by H&R are the firmest, non-adjustable kits they make. Slightly stiffer compression, rebound and spring rates give these coilovers great handling feedback, but at the expense of a little ride comfort. Height adjustable from 1-2.3 inches (25-58mm). These kits are ideal for someone who isn't interested in changing valving characteristics, and uses their daily driver for spirited canyon runs or track days. Only the finest materials and finishes are used to ensure longevity and consistent service.