They form large spherical balls of ice that slowly melt in drinks. The only downside is that water seeps through the holes in the top, creating small "bulges" in the final product. My solution was to use silicone plugs for the USB holes on the top, which seemed to work fine. I don't know where it's easy to find standalone forks of this size at the moment but they would make a deal on this item if they were available as are most comparable products on the market.
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