Crafted of Stoneware, featuring a reactive glaze. Due to the nature and hand-crafted qualities of reactive glaze, no two pieces are exactly alike and will exhibit unique variations in color and pattern. Product may slightly differ from image shown. These mugs are perfect for morning coffee, afternoon tea, or cocoa by the fire, but also great for juice, milk or tangy soup. Microwave and dishwasher safe. Set of 4 mugs, each holds 12 ounces.