Polish Pottery 10 Ounce Handmade Casual Mug From Boleslawiec Poland Ceramika Artystyczna Traditional Stoneware 1538 GENUINE: Each piece is certified as original and of First Quality FUNCTIONAL: Microwave, oven (to 450 F) and dishwasher safe EASE OF USE: Non-stick surface, cleans up in a breeze (No staining) SAFE: Lead and cadmium free UNIQUE: Each piece is hand painted and imported from Boleslawiec, Poland