HPI Racing now offers a Soft Shock Spring Set that gives Cup Racer cars a wide variety of tuning choices to dial in the handling of their cars to track conditions. This set is primarily designed for the laydown front shock position and gives optional spring choices to the copper colored kit springs. The set features 3 pairs of color coded springs for easy identification:

White (one step softer than the copper kit springs)
Silver (one step harder than the copper kit springs)
Gray (two steps harder than the copper kit springs)