Made in France since 1939 Impact & chip resistant, extremely durable Duralex tempered glass is 25 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 International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions. Ideal for both hot and cold drinks, these stackable, impact- and chip-resistant glasses feel very comfortable in your hand and can be used in the microwave or freezer.  The 8.75 oz is a universal size - great for cocktails, wine, juice, and as a kids glass. Dishwasher-safe.  FOOD SAFE AND Eco-safe ORGANIC COLORS.  Founded in 1939, Duralex has been manufacturing tempered glassware and tabletop products for over 80 years in La Chapelle-Saint-Mesmin in the very heart of France. Since 1939, when Duralex invented the glass tempering process, the name Duralex has been associated with toughened glassware, utilizing their proprietary process.