Duralex glasses are trendy and timeless in their design and lines. All Duralex glasses are made of tempered glass because tempered glass resists mechanical and thermal shock. Duralex glasses are impact and chip resistant--almost 2.5 times stronger than ordinary glasses. If a Duralex glass is broken, it will shatter into small pieces that are less likely to cut your hands when cleaning up. Stackable, affordable, hygenic, dishwasher-safe, impact and chip resistant, and ideally weighted. Made in France since 1939. Duralex glass is made of soda lime glass and is 100% tempered. Many competitors just temper the edges or rims. This is why Duralex sets the standard in tempered glass.