Fashioned after the superior style of the Picardie Tumblers, these tempered glass bowls are perfect for hot and cold liquids. Extremely durable. Suitable for freezer, microwave and dishwasher. After inventing the glass tempering process in 1939, Duralex has spent the last 80-plus years making stylish, functional, and durable tempered glassware and tabletop pieces in La Chapelle-Saint-Mesmin, right in the heart of France. Much like their process, the quality of their glassware has remained unchanged over the years, and these traditions have helped them become a familiar name in households around the world.