Enjoy a whiskey on the rocks without diluting your drink's flavor and aroma. skybar(TM) Chill Cubes are an innovative, reusable alternative to ice cubes-simply place a pre-chilled stainless-steel cube in your glass and your drink stays cold. An easy way to chill a glass of whiskey without diluting it. Pre-chill in the freezer for at least 3 hours prior to use. Fits in standard cocktail glasses. Convenient holders protect tabletops and other surfaces from moisture. Set includes two Whiskey Chill Cubes and two holders.