The Topeak Tubi Master X is a do-it-all trail side tubeless repair kit complete with tubeless plugs & CO2 inflation. Features: Advanced 2-in-1 injector head that plugs a puncture and inflates the tire in one step, or can be used as a standard inflator via the valve stem Compatible with both Presta and Schrader valves Includes velcro mounting module for attachment to seatposts or frames Includes a disc brake spacer for additional safety when having to remove the wheel from the frame or fork Additional tire plugs store out of the way inside the handle when not in use