This Double Double Whisky Diamond Glass Set will entertain your guest at your next event. Made with a double layer of mouth-blown borosilicate glass, each glass will keep hot and cold drinks insulated while the outside surface will remain comfortable in your hands. Two layers of this glass are used to give it ample insulation, style, and create an optical illusion. You can serve a variety of whiskeys and other beverages at different events. These glasses are microwave and dishwasher safe, so you don’t have to worry about them cracking or breaking due to temperature difference or abrasion. This diamond-shaped whiskey glasses set would be a great gift for a friend or colleague on a special occasion.