Lys 6 piece set includes 4;75 inch stackable clear bowls Made in France since 1939, 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; Lead free, cadmium free, and BPA free Dishwasher, fridge and microwave safe; products maintain the original look for years