For use with Restube Active, Restube Extreme, Restube Automatic, Restube Lifeguard, Restube Basic, Restube Swim, Restube Classic, and Restube Sports (all models except Restube beach). Includes: 16g CO2, galvanized steel & threaded Green safety clips Meets DIN EN ISO 12402-7 / UL 1191, salt water proof ISI/5503 Austria 11/18 For transport by air follow IATA-rules Not all CO2 cartridges are created alike, and we highly recommend only using the Restube spare cartridges which are made of a high quality galvanized steel, so there is there will be no rust or corrosion. In fact, the galvanized steel we use is 20x more higher strength than the life jacket industry standard. Make It Last Rinse your Restube device after each contact with salt water it can last for a long time. We also recommend checking the weight after a longer period of time. Each cartridge comes with a label indicating the individual weight.