Elevate your drinking experience with a little help from science. Placing a large ice cube in your glass will chill your whiskey, but it will also dilute your drink as it melts. Round ice helps solve the problem; it’s about volume and surface area. A sphere exposes less surface area for the same amount of volume than a cube of ice. The less surface area that's exposed, the slower the ice will melt. The silicone HM Ice Mold is a must for any discerning whiskey drinker.