Whiskey stone cools longer than ice and freezes to the last drop. It can be washed and refrigerated for 4-5 hours. It is very suitable for whisky, vodka, liqueur and white wine. 3 ,4 packs per bottle, extended cooling. Cool the whisky from the bottom. Food grade 304 stainless steel is completely sealed ice, does not affect health, does not dilute wine, can be directly stored in the refrigerator. A unique gift for the best man, father, husband, friend or spiritual drinker, paired with an elegant gift box set. Imagine that every time you want an iced drink, you just put the whiskey stone in the drink without waiting for the water to freeze.