These worked great to keep my drink cool and did not scratch the glass. I have been using these with most of the alcohols that I drink because I wanted to see why they are used for whiskey. I can't really find a difference when I use them in other alcohols. These stones are holding up great and I love that they have a little storage bag with them so they won't get damaged or lost. This is available on Amazon . I received this product at a discounted rate in exchange for a honest review.