The Muyu Double-walled Cup is like the other cups a great development for healthy drinks. This Cup is like the other cups on the inside from Muyu Stone, but is also on the outside pure Muyu Stone. With this cup your drink is gradually mineralized and pH balanced with a mix of immediately activated ionished trace minerals that join the drink and reach each (water) molecule in a profound way. Water in this cup turns into mineralized water after a while. Great cup to sustain your health. It gives you the opportunity to always have your drink enhancer with you wherever you go. Just fill it up when you arrive, leave it for a few minutes and enjoy. Try other fluids in the cup, like beer or juice. They turn out with a higher quality after a short while. Drink from the cup if you want, its fun, and rinse the cup without soap after your done.