The Libbey Flare Cobalt Blue Rocks Old Fashioned Tumblers Glasses set of 4 features a mid-century modern design with a vibrant cobalt blue color, perfect for any occasion. Made of glass in the United States during the 1960s, these round tumblers stand at 4.5 inches tall and are dishwasher safe for easy cleaning. The set of 4 Libbey tumblers adds a touch of vintage charm to your drinkware collection with their classic yet stylish design.