Set includes six Clear Mug;Duralex is 2-1/2 times more resistant to breakage and chipping than normal glass, can withstand sudden thermal shock.;Can also withstand sudden thermal shock, from -4ﾃつｰf to 212ﾃつｰf;Dishwasher, refrigerator and microwave safe, Products maintain the original look for years;Dualex glass is very hygienic, It is non-porous and does not absorb liquids, colors or flavors