Enjoy a cool and refreshing whiskey or other spirit without watering it down with this beverage stone kit. Inside of this gorgeous lined bamboo box are nine stainless steel stones, a pair of tongs and a black velvet storage bag. Just place the stones in the freezer until they're ice cold, and pop them in your drink for a clean and delicious beverage! Top of case is laser engravable for personalization. The natural stones are made from basalt, a natural occurring volcanic rock. Color can vary from black to gray. The natural stones are laser engravable.