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Question on coin flip, storage box...

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pandalover:
I search the net and see there is some common flip like "2x2 Vinyl Flips" and "SAFLIP 2x2 Non-Vinyl Flip".
Are they both acid-free and good for coin storage?

Also i see from auction that there is some plastic flip which fit graded coin slab perfectly, but i can't find any on the net, what are this flip called? or any link for such product?

Also i see there is NGC storage box which can hold around 20 graded slab, but i do not see NGC site have such item for selling, is these member/dealer-only items?

Further, what method do you use to prevent coin from humidity?

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