GUARANTEED COMPATIBILITY: Compatible with all soda makers that use threaded/screw-in 60L cylinders (SodaStream, Soda Sensei, Ninja Thirsti, etc.). Some cheap made CO2 brands may disqualify Drinkmate exchange program due to safety concerns! INCLUDES: Two 60L CO2 cylinders. Each cylinder makes up to 60L of carbonated beverages. Buy 2, 3, or 4 pack and save more! SIMPLE EXCHANGE PROGRAM: Drinkmate's online exchange program makes it easy to recycle empty cylinders. SodaStream and Soda Sense cylinders are also accepted for easy recycling. EASY RETURN SHIPPING: Each cylinder order includes a return shipping label, simply keep the box and apply the label once your cylinders are empty!