Drinkmate 10L (3 oz) cylinders come filled with FDA certified food grade CO2.  Lightweight and easily portable for use with the Drinkmate Spritzer. They are made of durable aluminum to US DOT standards.   6-pack of cylinders makes up to 96 half-liter bottles of sparkling beverages The preferred CO2 cylinder for the Drinkmate Spritzer. Compatible with all Drinkmate, iSoda and SodaStream (except Terra) appliances We will automatically include a prepaid return label in the package. Just reuse the box and attach the return label when your two cylinders are empty. Once we receive your empty cylinders, we will email you a gift certificate for your next purchase on our online store. Six 10L (3 oz) CO2 cylinders: $54 gift card rebate. *Note only one coupon can be applied per order* Ready to ship your cylinders? Click here for packing instructions. Free Shipping on CO2! *Items containing CO2 can only ship to the 48 contiguous states. Sorry for any inconvenience.*