They are very large and 5 for $15 was a steal. I received them and I have a few. After someone looked at it, they said don't put it in water (you know its whole purpose), it's not fully sealed, you can see where the water will go in. It doesn't show much promise for use with water. Good quality seals the entire hole, this is schematic. So if, like me, you intend to use it in the water, you might want to consider something else. It was a good deal, I thought I understood now that it's good to be true.
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