Perfect for sipping espresso, coffee or afternoon tea, these attractive mugs are a stylish addition to any table. Duralex glassware is made in France from tempered glass—a durable, nonporous material that is two-and-a-half times stronger than ordinary glass. Duralex glasses are stackable and safe—if broken, they shatter into small chunks rather than jagged shards—and are microwave, freezer and dishwasher safe.