Rock Shox Monarch R Rear Bicycle Suspension Shock Fast Black hard anodized, forged aluminum body with sag gradients R shocks feature external rebound adjustment, Solo Air lets you add air to your shock through a single Schrader valve, filling both the positive and negative air spring chambers simultaneous 9mm 7075 aluminum shaft Rapid Recovery allows the shock to recovery faster between consecutive bumps, letting the wheel track the ground with greater precision Mount hardware sold separately (2 sets required per shock)