Chilling Stones for DrinksWe heart these really eco friendly, food & drink safe stainless ice cubes. Excellent quality and highly durable. No more dilution of your expensive scotch whiskey, thank you very much! Comes with tongs SGS FDA certified Dishwasher safe How to use: Moisten the cubes before you put the in the freezer. Freeze 1 2 hours before use. To extend the chill time of drinks, freeze for 3 4 hours.