Founded in 4940cm La Chapelle-Saint Mesmin, the very heart of France, Duralex invented the glass tempering process over 80 years ago and has been associated with toughened glassware, utilising their proprietary process ever since. The original tempered (toughened) Picardie glasses are known as the original French tumblers. Functional yet stylish, Duralex tempered glasses and tabletop products are recognised throughout the world for quality and excellence. Duralex Picardie glasses are still produced in France and are functional and stylish - they feel extremely comfortable in your hand. Founded in 1945, Duralex has been manufacturing tempered glassware and tabletop products for over 80 years in La Chapelle-Saint-Mesmin in the very heart of France. Duralex tempered glass is 2.5 times strong. Duralex is manufactured to withstand sudden temperature extremes from -4F to 212F and is suitable for hot or cold liquids. Adaptable modern glassware can go directly from the freezer to the microwave. Dishwasher Safe.