With this set you can update 2 pcs of RCC shockabsorbers to the 2009 version. The 2009 version has a better seal / support package. The shockrod is supported better with the delrin bushing, and a new design x-ring, made of a special silicone rubber (instead of an o-ring) provides a better seal at less friction. A new mould for the nylon parts has been made, so also the nylon parts of the shocks are improved, both pistons and ball-joints too. Supersmooth shocks !