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4 stones in a cloth bag.
The bag of stones you put in the freezer and a moment later you have ice-cold stones that you can put in the whiskey or other drink.
The advantage of the stones is that they do not melt unlike ice cubes. This will prevent water from diluting your drink.
The stones are then easily washed and reused.
Approximate dimensions are 2.5 x 2.5 x 2.5 cm.