Yokomo Yatabe Arena Front Shock Spring Set (Black) (Turf/Carpet)Yokomo Yatabe Arena Big Bore Front Shock Springs were developed for extremely high traction surfaces, such as turf or carpet. These springs are slightly shorter in length and have been designed to handle jump landings better, as well as help prevent traction rolling. Yokomo Turf Carpet Front Shock Spring Rates: Hard YOKYAS 650: Purple YOKYAS 675: Black YOKYAS 700: Orange YOKYAS 800: Red YOKYAS 825: Yellow Soft Effects of Shock Spring Changes Shock