Bought these to complement an Aquamat I got when I was 3 years old. The Aquamat comes with 2 pens, so having a few others with different sized tips was a plus. Others have found them to be leaking. I haven't had this problem yet. They are good for use on a water mat and don't need to be tied to a specific brand. Remove the lid, fill with water and attach the lid to the body. Don't do much wrong.
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