Fox Factory Qs3-Qsr Piggyback Rear Shocks FOX Qs3-Qsr shocks feature a three-position compression and rebound adjustment mechanism, offering quick transitions from smooth cruising to aggressive riding. This adjustability ensures optimal performance across various riding conditions, keeping riders ahead with superior road adherence. Features: Model-specific optimized ride tune Qs3: 3-position quick switch compression adjustment Qsr: 3-position quick switch rebound adjustment Spring preload setting guide marks Aluminum piggyback reservoirs Gas-charged mono-tube with internal floating piston (Ifp) design 1.5-inch diameter 6061-T6 aluminum type III hard-anodized bodies Fully rebuildable and re-valve-able Advanced high-flow, deflective disc velocity-sensitive damping 5/8-inch diameter, low friction, super-finished hard chrome shafts Matte black springs and black-anodized preload rings