All pieces in the SABLO series are made from a unique blend of colored clay, quartz, minerals such as calcite, and oxides, and are formed using a casting process. The high firing temperatures make stoneware more durable than clay. Colors, shapes, and the appearance of the glaze can vary, making each piece unique with individual textures and shades. All SABLO tableware is fired at very high temperatures and does not require glazing on all surfaces. It is microwave-safe and dishwasher-safe.