Basily Premium 4 Heart Shaped Stainless Steel Reusable Chilling Stones &hellip; A superior quality whiskey stone, made from food grade stainless steel. They will never rust or wear with time, can be used in the dishwasher and will keep their brilliant color forever. Contain a non-toxic chilling gel in the center, which allows for minimum freezing time (1-2 hrs.) and longer cooling time, over any other type on the market. They can also stay cold for hours under the proper conditions, like in a thermos or cooler. Can be used in any alcoholic or regular beverage, 100% Eco-friendly, odorless, tasteless and very modern. Although, there are no whiskey stones that will cool your drink as cold as ice, our stainless steel ice cubes are without a doubt, the best alternative on the market. DIRECTIONS: Freeze the stones first then Place the whiskey stones in a glass and pour your drink over them. If used in a warm drink, use them all for maximum results and do not hold your glass, this warms the liquid up. They sink to the bottom of the glass, so the bottom will get colder first, let the whiskey stones sit for a few minutes, then give your glass a swirl and enjoy!