Drinkers who prefer sipping tipples like bourbon, scotch or tequila will appreciate the Roller Rock glass. The rocks glass comes with an ice ball mold that you can place directly into your drink.
As the filled ice ball mold circles around, it'll chill your liquor of choice. Best of all, the mold will safeguard your drink from dilution as the ice melts. Pick one up at the link below, and check out the Cirrus ice ball press for a different spin on this theme.