Vapolution Vaporizers has been making the ONLY glass on glass vaporizer since 2000. Other companies claim to be glass on glass, but this is not true. Take a closer look and you will see, Vapolution is the only one to eliminate metals, ceramics and plastics from the air path. The vapor our device produces has the best flavor when compared to any other vaporizer on the market. Try it for yourself. All Glass Means Pure Vapor!