The top bore 13.2mm shocks parts are redesigned for general management and performance improvements. The top bore shocks improve landings and provide better control over surface unevenness and bumps to improve traction. There are two various depth pistons (2.0 and 2.5mm). The super-efficient pre-oiled X-rings guarantee smooth operation and stop dust in the surprise set up. The XB2 surprise absorbers function eccentric lower mounting pivot ball that changes the angle of the shocks whenever installed into the supply. Shock expansion is restricted using composite shims under the pistons. Maximum compression is limited making use of composite shims beneath the surprise collar. The shock absorber is universal for both Dirt and Carpet edition. This set includes composite bushings for aluminum shock caps. Do not use these composite bushings for composite shock cap out of this set. Keep in mind that pivot balls for lower ball bones is employed from your kit or purchase individually. Verify the X-rings are preoiled before installation.