Ideal size for use in narrow-mouth bottles. They fit perfectly in my Brita water bottle. The ice balls are SMALL ENOUGH TO FIT ENTIRELY IN A CHILD'S MOUTH SO FOLLOW YOUR CHILDREN ON USE. They are about the size of a sucker's head. I figured that was common sense, but judging by the reviews on here, who gets mad because their kid choked? smh Oh, you also fill them out by placing the NON-perforated side in the sink, filling it completely, then snapping the perforated side on top. Excess water exits through the holes. And yes, they can be stacked. Definitely ordered more.
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