Duralex - Picardie Marine Blue Tumbler 22 CL (7 3/4 Oz) Set of 4 Set Includes: four 7 3/4 ounce glasses Duralex is 2-1/2 times more resistant to breakage and chipping than normal glass, can withstand sudden thermal shock. Can also withstand sudden thermal shock, from -4f to 212f Dishwasher, refrigerator and microwave safe, Products maintain the original look for years Dualex glass is very hygienic, It is non-porous and does not absorb liquids, colors or flavors