Team Associated 13mm Rear Shock Springs. These optional springs are intended for the Team Associated T6.2 and the SC6.2 when upgrading to 13mm shocks. The larger 13mm-bore piston allows you to run lighter oils to get the low-speed feeling of a soft shock, but with more pack as you take off and land jumps. This translates to a truck that soaks up the bumps in and out of corners but packs up in the high-speed landings to give you the feeling of landing on a pillow. Package includes two springs.