ADJUSTMENTS: Calibrated to work with 129" rMotion MXZ rear suspensions. QS Series provides easily adjustable high, medium, low compression settings New QSR quick switch 3 position rebound adjustment. FEATURES: Genuine Kashima coat. FOX Ice Scraper Technology (FIST). Aerospace-grade PTFE-lined spherical bearings. High-flow velocity-sensitive damping. Fully rebuildable and revalveable.REV Gen4 MXZ (except 2021 X & X-RS Package)