When I got them I didn't really know how they work. It consists of a hard plastic top and a soft bottom. You fill them up, and when you're cold, press down on the soft bottom and the cubes pop out. It was a little weird at first, but I got used to it. Time will tell how long they last. The cubes are also quite small, 1" x 3/4" x 1/2" deep. It took me nearly a hundred trays to chill my drink.
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