A set of two shapely double-walled whiskey glasses nested inside a spill preventing silicone base. Made from chemistry-grade borosilicate glass, the design insulates the glass, keeping beverages cold & hot longer. You'll love the pleasing optical effect of liquid floating inside the glass. Made from durable hand-blown glass, they present far fewer defects compared to other glasses. And they're backed by a lifetime warranty, so you'll receive high quality glassware you'll enjoy for years to come.