Made from "wild clay", foraged from the Sierra Nevada foothills and minimally processed to preserve its unique character. This cup was formed on a potters wheel, and faceted with a wire tool while still wet to created the vertical planes around it. A generous amount of clay was used for this, and it has a pleasant heaviness to it while still being comfortably weighted. It was fired in a soda kiln, with wood added to create the range of dark tones in the clay. The inside is glazed for easy cleaning. I like these cups for whiskey or other spirits, but they do well as smaller teacups too. Measures about 3.25" tall Microwave safe, hand wash recommended.