The set has six small glasses, each with a capacity of 4-1/4 ounces and measurements of 3 inches in height and 2 3/4 inches in diameter. These French tumblers are produced in France by the company that created tempered glass. Duralex is much more resistant to breakage and chipping than traditional glass, and it can handle sudden thermal shock. With a temperature range from -4 degrees F to 212 degrees F, Duralex glass is highly hygienic, as it is non-porous and does not absorb liquids, colors, or flavors. These products are safe to use in the dishwasher, refrigerator, and microwave, and they will maintain their original appearance for many years.