Clay is a porcelain stoneware mix. Carved pattern and painted with cobalt blue, red, and yellow underglaze and a glossy clear finish outside and white on the inside. Stamped on the bottom. Each bowl is hand-built, carved, painted free hand and is unique. Each with a flower and sun carved into it. Dimensions vary slightly. Dishwasher safe. Photographs do not depict the exact piece you will receive.