This is a Spring Assortment for the Pro-Line PowerStroke SC shocks. Take your PowerStroke shocks to the next level with Pro-Line's Spring Assortment. Now you can adjust ride heights and dual-rate spring rates almost infinitely with these color coded springs. Kit comes with six primary (short) and six secondary (long) high quality springs with color coded stripes to reference rates. A great option part for the Pro-Line PRO-2 SC truck kit.