They are made of a dark stoneware clay and are wheel thrown and trimmed by hand in my own studio. I added a pulled handle. They are glazed in a white glaze. It is fired to cone 6 (2290 Deg F) in an oxidation environment. They measures 3 inches across at the top and 5 inches including the handle. It measures 3.5 inches high and hold 12 ounces of your favorite beverage. The mug is pleasing to hold and will keep your drink piping hot.