Compatible with gas cylinders approved for sparkling water makers of all major global brands. The sparkling water maker is made of stainless steel. Included in the package: sparkling water maker, water bottle (PET), user manual, gas cylinder not included. Compact design: The Aarke sparkling water maker is designed to be extremely compact both inside and out. Nevertheless, it features a unique safety system consisting of three independent safety valves. Easy to use: The lever carbonates the water and automatically releases the pressure in the bottle. Simply press the lever and hold it until you hear a buzz, then release it and unscrew the bottle from the machine. It couldn't be easier. High-quality craftsmanship: Aarke is the world's first sparkling water maker equipped with a complete stainless steel casing. Forget the old plastic soda makers and opt for a device whose timeless design perfectly complements your kitchen countertop and will delight you for many years.