The Tovolo Skull Craft Ice Molds turn a pour of whiskey or bourbon into a conversation piece. The set of 2 makes large skull-shaped ice, about 3 inches across, with intricate bone detail and hollow eye sockets pressed into every piece. Large ice melts more slowly than standard cubes, so cocktails stay cold without watering down. Fill each mold with water to the fill line through the opening, freeze for 4 to 6 hours, then twist the flexible silicone and the skull releases cleanly. Tight-fitting lids prevent spills on the way to the freezer and lock out freezer odors. Each mold measures 4.75 by 3 by 5 inches, and the molds stack to save freezer space. They are made of BPA-free plastic and silicone, hold up to repeated freezing and are dishwasher safe.