Duralex - Picardie Clear Tumbler 18 pcs Set - 6 X 250ML, 6 X 360ML 6 X 500ML Set includes 6 X 250ML, 6 X 360ML & 6 X 500ML glasses The original French tumbler, made in France, the company that invented tempered glass Duralex is 2-1/2 times more resistant to breakage and chipping than normal glass, can 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, refrigerator and microwave safe, Products maintain the original look for years