iSi soda chargers with 8.4g of Carbon Dioxide, for use with iSi Classic SodaMaker and iSi Stainless Steel Soda Siphon; recyclable; product of Austria | Includes one box of 10 soda chargers in gold; each charger holds 8.4 grams of pure CO2. Made from recycled steel | The best choice for carbonating beverages. For best results always use very cold water | Each charger is electronically weighed and sealed for maximum consistent results. Each charger includes a batch number for identification; 1 charger carbonates up to 1 quart of liquid | For use with iSi Classic SodaMaker and soda siphons: Insert charger into an iSi Charger holder, screw onto an iSi siphon to release gas. Shake and dispense. Recycle charger with metal.