This BRS 4pc Double Wall Mug Set unfamiliar with borosilicate glass will be surprised by the weight, but rest assure it's genuine. The double walled design makes these cups less fragile, It would take a hard fall to break them. They have a solid feel and will hold up as well as any other lightweight dish or glass.

• 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 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.

• Condesation 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