Whip-eez 40 Pack Co2 Chargers Make sparkling seltzer in seconds and keep refrigerated for a week. Each charger makes about a quart. Whip-eez Chargers do not have an expiration date and are the Best Quality Chargers available in the U.S. Restaurant Quality Pure Co2 - Whip-eez Brand Co2 is Pure Carbon Dioxide Gas in standard 8 gram chargers for the coffee shop, restaurant, bar, ice cream shop and gourmet food market. Formulated for discerning tastes Whip-eez Brand Carbon Dioxide (Co2) Soda Chargers are manufactured by one of Europe's largest and most respected Co2 and N2o production facilities. Co2 (carbon dioxide) is an odorless, colorless, non-flammable gas. It does not contain any minerals, salts or other solid ingredients. It is used worldwide for food preparation, deep freezing and to produce carbonated soft drinks and soda water. Whip-eez Brand chargers are 100% compatible with all standard screw valve dispensers including all iSi Whip Cream dispensers (whippers) and Soda Siphons, Liss Whipped Cream Dispensers and Soda Siphons, and Kovocas of Czechoslovakia. With the exception of the Kisag Push Valve units, our chargers are guaranteed to work with all dispensers currently for sale in North America. Chargers measure 2-9/16" long and 11/16" in diameter. All of our Whip-eez consumer nitrous oxide and carbon dioxide chargers are manufactured in strict compliance with guidelines specified by the International Standards Organization. Please note : These chargers are NOT for making whipped cream