More informationA CO2 cylinder kit that can be placed in the frame holes for the bottle cage, attached to the UNCAGE SIDE side entry bottle cage or to the AEROMAN triathlon bottle cage attachment. It also includes a velcro strap to carry a camera and tire levers.Features :Compatible with Presta and Schrader valves.Material: CNC machined aluminum (valve adapter), silicone (grip).Measurements: 10 x 5.1 x 3.7 cm. Weight: 158 g. Includes: An E-grip valve adapter, 2 16 g bottles. and a velcro strap.