It took a while to cool down from room temperature. chilled the drink but didn't make it "cold". The drink did not cool for a very long time. I've used them to sip bourbon (three cubes in a Glencairn glass) and I've used many different types for this, including large stainless steel cubes and balls, large ice balls, whiskey stones, and so on. I would say that they came out worst in terms of overall cooling drink performance and cold keeping.
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