This iSi 000499 CO2 soda chargers are made with 8.4 grams pure Carbon Dioxide gas and 100% recyclable steel. Individually weighed electronically measured. Used for carbonation of water, they have a leak proof design. Gold color. Each charger is good for 1 bottle fill. For use with iSi Soda Siphon. 5-year guaranteed shelf life. Comes in a box of 10. Made in Austria.