POLARIS RZR PRO XP TENDER SPRING KIT (WALKER EVANS NEEDLE SHOCK)QUICK OVERVIEW Factory tender springs just dont cut it and most of them are already sagging out on the showroom floor. Adding the ZBROZ Tender Spring Kit is one way to dramatically improve your Pro XPs ride quality while at the same time increasing lift by up 1 2. Factory tender springs just dont cut it and most of them are already sagging out on the showroom floor. Adding the ZBROZ Tender Spring Kit is one way to dramatically improve your Pro XPs