These 2.5" Diameter Shocks for the rear of the 2009 - current Dodge Ram 1500 offer both incredible performance and ride quality. These shocks are tuned and valved specifically for the best on and off road performance. They are constructed of the same high quality components used in the all of ICON's coil-over shocks. The PiggyBack Reservoir gives the shock added heat dissipation and its locations gives the shock an internal bump zone. This bump zone gives added control and stability when the suspension is pushed to full compression.