Includes 1 x 16g cartridge, 1 x silicone grip and 1 x CO2 pump head. Presta and Schrader compatible. 16g of CO2 is enough to inflated a 700x23 road tyre to 120 PSI, and a 26" MTB tyre to 30 PSI. Birzman work exhaustively to design better tools and better rider experiences.