EuroQuest Imports 12-Ounce Mugs in Country Blue Pattern, Set of 2 Bunzlauer stoneware set of 2 12 ounce mugs made in boleslawiec, poland Fired at temperatures above 2,300 degrees f creating long lasting beauty Displays artisans initials and unique zaklady back stamp Mugs are lead free Safe in oven, microwave and dishwasher