Drinkmate 60L (14.5 oz) refill cylinders come filled with food grade CO2.  Made of durable aluminum to US DOT standards, they are also compatible with SodaStream (except pink label quick-connect machines) and other brands of soda makers. Each cylinder will make up to 60 liters of sparkling drinks, depending on the amount of carbonation desired. Three-pack of cylinders makes up to 180 one-liter bottles of sparkling beverages!  Each cylinder order includes a return shipping label to make exchanging easy! Simply keep the box and apply the label once your cylinders are empty. Once we receive your empty cylinders, you will be issued a coupon to use towards your next CO2 purchase. Compatible with Drinkmate, SodaStream (except pink label quick-connect), Aarke, Philips, Ninja Thirsi, and all other soda maker appliances in the Americas that use threaded CO2 cylinders. Click here for CO2 Exchange info! Free Shipping on CO2! *This bundle cannot ship to a PO box per USPS regulations, please provide an address UPS or FedEx can ship to. Items containing CO2 can only ship to the 48 contiguous states. Sorry for any inconvenience.*