Swirling whiskey around the glass can help improve the flavor and aroma. Spinning a glass of whiskey is a time-honored barstool fidgeting move. These Revolve whiskey glasses combine both. Made from lead-free crystal with etching for grip and added visual interest, they have hidden bumps on the bottom of the glasses that let them spin effortlessly on a hard surface, aerating the spirit while giving idle hands something to do.