This set of 9 whiskey chilling rocks and muslin storage pouch makes a great gift for whiskey enthusiasts. They are made from soapstone, which maintains its temperature for long periods of time, is regarded as safe by the FDA, and will not react to water, alcohol, or other drinks. Just wash the chilling rocks and place them in the freezer to use them at any time; they provide a slight chill to take the edge off without diluting your drink.