ELSKY Food Grade Stainless Steel Cooling Cubes, Deluxe Whiskey Stones, Reusable Ice Cubes Chilling Frozen Rocks for Wine, Beer,  Beverage Juice - Pack of 8 with Tip Tongs FDA-approved 304 grade stainless steel liquid-filled cubes are non-diluting alternative to ice cubes. Chill your favorite beverages and dont worry about the ice cubes melting and watering down your drink. Place sipping stones in freezer for 2-4 hours,then drop 3-4 cubes into your drink, after a short while, just sip your drinks. ELSKY cooling cubes are great for whiskey,wine,vodka,liqueurs,coffee,juice,soda,soft drinks and more. Unique gift for spirit drinkers. Durable chilling rocks,easy to wash and clean.