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 Gray Circles Mug is perfect for enjoying your favorite beverage every day. Adorned with an attractive line design, and featuring a contemporary, tall and thin body, this mug is perfect for casual use. Microwave and dishwasher safe. Mug holds 16 ounces.