1/10 Spring Assortment for Shocks 6364-00Features Take your PRO636400 MAXX PowerStroke Shocks to the Next Level Tune your Spring Rates and Dial in your Suspension to the Conditions Three Different Upper and Three Different Lower Springs Allow for Nine Different Combinations Overview This is a Spring Assortment for PRO636400 PowerStroke Shocks. Take your PRO636400 MAXX PowerStroke Shocks to the next level by tuning them to match your specific needs with the optional Dual Rate Front Spring