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Practical, simple, sophisticated. This Duralex Lys Stackable mug will last -- and continue to look great -- through a lifetime of use. The crystal-clear tempered glass is astoundingly strong and shock resistant for hot-and-cold use, and the convenient stackable design saves space in your cupboard. 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.