Duralex Picardie Glassware Tumblers are functional yet stylish glasses that feel extremely comfortable in the hand. Highly durable, Picardie glasses are equally suitable for cold or hot drinks, conveniently stackable, impact and chip resistant. Duralex glassware is 2-1/2 times more resistant to breakage and chipping than normal glass, and can also withstand thermal shock from -4 to 212-degrees F. Known as the original French tumblers, Picardie glasses have been in production since 1939, when Duralex invented the glass tempering process. Duralex has been manufacturing tempered glassware and tabletop products for over 80 years in La Chapelle-Saint-Mesmin in the very heart of France. Microwave, refrigerator and dishwasher safe. Made in France. Set of 6.