MADE IN FRANCE Since 1939. IMPACT & CHIP RESISTANT, EXTREMELY DURABLE Duralex tempered glass is 2.5 times stronger than ordinary glass;SHOCK RESISTANT Manufactured to withstand sudden temperature extremes from -4 DegreeF to 266 DegreeF and is suitable for hot or cold liquids;FREEZER, MICROWAVE & DISHWASHER SAFE. Adaptable modern glassware can go directly from the freezer to the microwave;STACKABLE. Duralex glasses and bowls are stackable for convenient and space saving storage. HYGIENIC Nonporous Duralex glass does not absorb liquid;TOP QUALITY Constant quality control guarantees excellence and built in durability insures that Duralex products will maintain their look for many years