The Hobbit An Unexpected Journey - Thermal Mug &ndash; Characters The Company How do you reveal the hidden inscription in the One Ring? Apply heat! The same principle applies to this mug bearing The Hobbit logo. Add any hot beverage and the cast appears! Perfect for work, school, home, or as a gift to a friend who will undoubtedly appreciate your generosity. Holds about 11 ounces. Not microwave or dishwasher safe.