Warm up your hands with this charming rustic coffee mug. Part of the Element collection of coordinating mugs, bowls, and serve ware from Danica Heirloom. Material content: stoneware with a reactive glaze. Care instructions: microwave and dishwasher safe. The nature and beauty of reactive glaze is that each piece is unique. There may be slight variations in color, texture, and finish to each perfectly imperfect item.