Final Touch On The Rock Glass with Ice Ball Mould, 2 Piece Better flavor, better aromas, a better way to drink "on the rocks" Glass tumbler has a special rock shape on the bottom of the glass Includes silicone mold for making ice ball that swirls around bottom of the glass Swirling the ice ball around releases aromas and flavors in your scotch, whiskey, bourbon or other liquor The shape of the glass makes rolling the ice ball easy, cooling drinks quickly and evenly without spilling