Polish Pottery 11 Ounce Casual Mug Handmade From Boleslawiec Poland Ceramika Artystyczna Traditional Series Butterfly Stoneware Pattern GENUINE: Each piece is certified as original and of First Quality FUNCTIONAL ART: 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