Duralex Lys Square Stacking Mixing Glass Bowl 3.5", Set of 6 Duralex glass is very hygienic: it is non-porous and does not absorb liquids, colors or flavors The original french glassware, made by the company that invented tempered glass Dishwasher, refrigerator and microwave safe; Products maintain the original look for years Duralex is 2.5 times more resistant to breakage and chipping than normal glass, can also withstand sudden thermal shock: