PROLINE ULTRA RESERVOIR SHOCKCAP FOR TRAXXAS X-MAXX (2)Are you ready to take the Performance of your X MAXX to the Next Level? Introducing Pro Line's Ultra Reservoir Shock Caps that fit directly onto the stock X MAXX shocks and transform them into fully functional Reservoir Shocks! The additional Reservoir provides more oil volume to your X MAXX shocks which results in cooler shock temps and improved shock consistency. The Reservoir Piston compensates for the volume of the Shock Shaft delivering Plush