Oxford Gourmet Mugs (Set of 4), White Set of 4 Mugs (11 oz. each). Professional Grade Porcelain - same as used at Starbucks, Costa Cafe, Coffee Bean, Lavezzi Pure White 100% Lead-Free High-quality exterior enamel protects against metal marks and other damage Unmatched thermal resistance from -65F to 500F. Safe for the freezer, microwave and dishwasher