Granite Whiskey Stones – Set of 9 Reusable Chilling Rocks with Storage Bag, Beverage Cooler for Whiskey, Bourbon, and Cocktails

Only reason I gave it two stars is because I'm giving it the benefit of the doubt since I freeze the glass I use to drink out of with these stones in it. Apart from that, it didn't keep my drink cold for more than 30min and I usually use about 4 at a time. If you drink really fast then maybe it'll work better for you.

Do not chill

Used it twice and horrible experience both times. After freezing them for several hours, it did not cool the beverage, nor did it help keep cool previously chilled beverages.

Work perfectly. Keep the whisky cold and do not water it down.

Keeps drinks cold without diluting them with regular ice. Great gift item.

I use these primarily for liquor and wine, but Ive also used them for cold fizzy mocktails and sprkling water.