Polish Pottery Bubble Mug 12 ounces Green Bird Garden UNIKAT Microwave dishwasher freezer and oven safe up to 500 Degree safe to use with food lead and cadmium free chip and crack resistant easy to clean Made of out stoneware painted by hand using sponges and brushes covered with hard and lustrous glaze that is scratch 2280F Made in Boleslawiec, Poland region famous for its high quality ceramics history of making pottery in the region dates back to 14thcentury Premium quality European stoneware certified to be Quality 1 selection 3.62" high and measures 3.35" by 4.72". It holds 12 ounces of fluid.