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I'm guessing 2 mm. I don't think it really matters much. It is what it is . I use whatever I can get cheap or free. There is one type that Walmart sells that has 1side that you can peel the paper off to reveal a sticky side. It works great for affixing mylar wrapping paper,tin foil or ...whatever prior to epoxying the whole thing. You can make Gurglers with it too. You can use as many layers/colors of it that you want to achieve different buoyancy.
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