2x2 flips are generally considered ok most have Mylar for the window portion and no PVC they are no air tight so where you store them is important too.
Quote: What type of plastic holders? I recommend Airtite brand!
i recently switched over to these. a buddy of mine also recommended these as well. I noticed that my silver bullion coins were toning in dansco albums, so I made the switch.
You could do as I do and cover with liquid plastic. Then make pen holders out of them
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Just kidding of course. Those flips are what most people use and are really safe. If you plan on long term storage in those I suggest you seal the edges with clear tape, not staples. Staples will still allow air to get to your coins.
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