These are wonderful little whiskey stones! They do take a little bit of time to cool down a tall glass so you need to plan ahead, although a smaller one doens't seem to take much time at all. I have tried them both in water and for the fun of it I also tried them in a shot of whiskey. These do a great job of cooling your beverage down without any dilution which is a definite bonus They will start to warm back up after a bit so make sure it is something you do not necessarily need ice cold or are planning drinking within a short time.
Great buy, very asthetically pleasing and they get the job done!
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https://www.amazon.com/EBeauty-Reusable-Stainless-Chilling-Beverage/dp/B01NCVJ03M