Set includes six 12-ounce glasses. The Picardie tempered glasses are suitable for hot or cold drinks and conveniently stackable The original french tumbler, made by the company that invented tempered glass Duralex is 2-1/2 times more resistant to breakage and chipping than normal glass, can also withstand sudden thermal shock: from -4-degree F to 212-degree F Duralex glass is very hygienic: it is non-porous and does not absorb liquids, colors or flavors Dishwasher, fridge and microwave safe; Products maintain the original look for years