Duralex Universel 7.75 oz 22 Cl Tumbler (Set of 6), Clear Glass 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 Stackable. Duralex glasses and bowls are stackable for convenient and space saving storage. Hygienic nonporous Duralex glass does not absorb liquid Freezer, microwave & dishwasher safe. Adaptable modern glassware can go directly from the freezer to the microwave Top quality. Every day, all day. Constant quality control guarantees excellence and built in durability insures that Duralex products will maintain their look for many years