This mug is made of black clay, hand painted with underglazes and the interior, lip and handle are glazed. The mug holds 10-12 fluid ounces. The unglazed area has the texture of raw clay. This mug is food safe and dishwasher safe but it is NOT microwave safe. Black clay gets VERY hot in the microwave so if you tend to microwave hot drinks, this mug is NOT for you, please look at the oatmeal clay mugs instead.