So, you’ve got your fancy drink, but you need to let it breath while staying cool. You need this set then. The silicone mold makes the perfect ice ball and the glass has a “rock” at the bottom of it. (I guess that’s a new meaning to “on the rocks”?) This allows the ice ball to roll around your drink, aerating and cooling it, releasing the natural aromas. The glass is shaped nicely so that you can swirl it around without spillage.