Aerflo devices are made of mostly Tritan™ plastic, which is a well-known BPA-free plastic used in most reusable water bottles.
Other components are made of 300 Series Stainless Steel, silicone, other food-safe plastics, and metal alloys.
Aerflo capsules are made of industry-standard aluminum cylinders and brass. The capsules are filled with beverage-grade CO2. Other materials include food-grade plastics and silicone.