All Bypass Shocks utilize the Solid Shock CO. “Free Bleed” system allowing for easier tuning and better performance/comfort over many different types of terrain. Our “Free Bleed” system utilizes a mono tube. All Solid Shock CO. Bypasses are equipped with a single tube except for our 4.0″ (18″ and 20″) sizes which have two tubes because of their size. All shocks can be customized and built to order. Please give us a call about your custom shock needs! Shocks are sold individually.