The label says 'moisture resistant' but at least the one I received was well formed and had a good seal that sealed fairly tightly. The quality of the strips and surfaces were also good in my opinion. Pretty strong too. Will hold up well when full and thrown. Didn't think to look under the cards but the label suggests so. Note: They are exactly the same as others at Revain, like the Shark whistle, but this one goes by the Forney name and was actually cheaper. Get the one that costs less.
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