Hamilton Beach Soda Station CO2 Cartridges Each box contains 10 single-use 8-gram CO2 cartridges. The steel cartridges are recyclable. Use Hamilton Beach SodaStation CO2 Cartridges exclusively with the Hamilton Beach SodaStation Handheld Carbonated Water and Soda Maker Single-use 8g CO2 cartridges Made of steel Recyclable 99.5 percent pure CO2 For use with SodaStation Handheld Carbonated Water and Soda Maker