RC-Art HP Damper Set - BlackRC Art (#ART3093) HP Damper Set Black Feature: For: Universal Parts The piston is the key to this damper! The outer diameter is reviewed from the conventional piston. and the piston with an unique thickness changes the damping speed in the low speed range and the high speed range. The length of the damper shaft is different for the front (28mm) and rear (30mm). The shaft that has been polished to a perfect circle and is finished as a shaft that shines