Picardie 18 piece set includes six 8 3/4 ounce tumblers, six 12 ounce tumblers and 16 7/8 ounce tumblers;The original french tumbler, made by the company that invented tempered glass;Duralex is 2-1/2 times more resistant to breakage, sudden thermal shock and chipping than normal glass;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