Definitely not 4 mil thick, but it was the right size, just not what I was looking for. I have a few photos of two different ones (this one I just bought and the other one I bought years ago hoping to be able to replace because they are gone). You can see the difference between them and they are both 4 mil thick. The one on the left is this product and the one on the right is from years ago. You can see a little difference. I think I will return this item.
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