Although amazingly similar, no two Deneen Pottery Mugs are exactly the same. Twenty-four pairs of hands touch each piece during the production process. And while every mug is uniform in size and shape, they are all created by hand. This beautiful Big Hole National Battlefield Deneen Pottery Mug is lead free and food safe. Kiln fired to 2100 degrees Fahrenheit, each piece is durable and safe for the microwave, dishwasher, oven, and freezer.