Two per box - are made from Borosilicate glass which can withstand very high temperatures. What makes these glasses so unique, is that the vacuum between the two glass walls ensures the temperature does not transfer from one wall to the other. They keep the content at it's desired temperature, regardless of the surroundings. Thus, your hands will not burn when holding a hot cup of coffee or, for that matter, freeze while drinking a milkshake. They are dishwasher safe, comfortable to hold.
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