This hi-fired ceramic coffee mug is durable and one of a kind. It was thrown on a potter's wheel from a lump of clay and then hand painted beautifully by The Bunny Guy. It is dishwasher and and microwave safe and can even be used in an oven up to 450 degrees. It is totally food safe and will last a lifetime. This one of a kind mug is the only one available and once it is gone, that is it. It holds 18 oz. when full. I noticed a blue spot in the glaze that you can see in the fourth picture.