Material: durable Eco-Gres® stoneware, which is made from non-hazardous recycled materials, primarily ceramic surplus, and other additives. The item is glazed in semi-matte black on the interior and left raw on the exterior. The matte, delicate surface is more susceptible to cutlery marking than our vitro porcelain and should be handled carefully if knives are used. Dishwasher and microwave oven safe.