The Birzman CO2 bottle 16g is so perfect little spare supply of CO2 to keep you going for those long-distance rides or if you have more than one puncher in a day. With its CNC finished body, Birzman CO2 Cartridge will last long and fit well with your CO2 pump. Make sure you don’t go out without a spare cartridge, and with it being 16g, this is the perfect size to inflate a road tyre.