A Unique Double Wall Mug: Why settle for an ordinary mug when you can enjoy your coffee or tea drink in beautiful modern cups that maintain the temperature – and your enjoyment. And they create a floating optical effect at the same time! Made of Hand-blown Borosilicate Glass: Just because they’re pretty doesn’t mean they’re not tough. While lighter and thinner than other mugs, they are made from hand blown borosilicate glass, so the the glass is stronger and has far fewer defects. Condensation Resistant Design: The insulation effect of the double-walled design keeps your iced coffee cold longer, and the thermal properties of this design virtually eliminates condensation on the outside glass. Far better for your tabletop! Dishwasher and Microwave Safe: Made of premium quality materials, these attractive hand-blown coffee and tea cups have been designed and manufactured for regular everyday use. They are fine in the dishwasher, microwave – and in even the freezer. Epar? Trusted Quality: You will receive two (2) Coffee Mugs measuring 5 inches across (including handle), 4.5 inches tall and 3.5 inches across the bottom, with a 6.1 oz weight and a 12-ounce capacity. We stand behind our quality.