Boleslawiec Polish Pottery Bubble Mug 16 oz Coffee Mug or Tea Cup Unikat Eva's Collection "Isabelle" 4" dia and 4" tall, holds 16 Oz Oven, microwave, dishwasher and freezer safe without losing the beautiful colors and textures. Polish Pottery from Boleslawiec is scratch and chip resistant; lead and cadmium free Premium European Stoneware Certified Quality 1. Part of Eva's Collection Fired at temperatures over 2,300 degrees F for long-lasting beauty.