Made of Opal glass; tempered glass for durability (mechanica and thermal shock resistance); completely hygienic: does not absorb odors and flavors; external texture with a feel of genuine artistry; Cookware is highly resistant to scratches, abrasion, thermal shock, is non-porous and therefore prevents the establishment of bacteria, maintains the temperature of food is 100% recyclable. Can be used in a microwave oven, dishwasher safe.