Polish Pottery 16 Oz. Soup Chili Mug Handmade Boleslawiec Traditional Stoneware Pattern 1915 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