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. This mug is perfect for morning coffee, afternoon tea, or cocoa by the fire, but its also great for juice, milk or tangy soup. Fill with flavored coffee or tea making a lovely gift for a friend or co-worker. Microwave and dishwasher safe. Set of 4 mugs, each 4 inch high and holds 13 ounces.