True dual-stage spring rate Aluminum body and shock cap Infinite spring pre-load adjustment Beefy 3.5mm shock shafts Injection molded, super durable spring retainer and shock ends Bladder sealed shock cap Free flow molded pistons Dual O-ring seats and upper and lower shock shaft guides Pre-assembled - just add oil Fits stock Slash or ProTrac Suspension Kit for Slash Overview Enhance the overall performance of your stock Slash or your ProTrac Suspension Kit Slash with PowerStroke Shocks. What's included: PowerStroke Performance Shocks Rebuild Kit (rebuild for 2 pcs shocks)