Ski-doo Summit Plug-N-Play Shock Package: This is a rear skid Fox Shock package for the 2012-2017 T-Motion Ski-doo (except T3- 174"). This kit includes a Fox Float Evol R3 center shock which has two air chambers to control plushness of ride and also a stiffer "bottom out" setting. This shock also has adjustable rebound with the turn of a knob. The rear shock is a Fox 1.5 ZERO QS3 which offers 3 lever quick adjust calibrations"soft medium hard" . This is a phenominal package for the price and really excelled in performance and adjustability in all our testing last season. This is a "best bang for the buck" fully adjustable shock package for the Ski-doo T-motion.