Biona Perfect Blue 16 Piece Dinnerware Set High-quality exterior enamel protects against metal marks and other damage. 100% High Grade Earthenware Hard-wearing, impermeable finish fired at temperatures as high as 2192F - less than 1% porosity 4 x Dinner Plates, 4 x Salad Plates, 4 x Mugs, 4 x Bowls Unmatched thermal resistance from -65F to 500F. Safe for the freezer, microwave and dishwasher