if they're not valuable, I'd go with the 9 pocket polyethylene sheets like Ultra Pro. If they are somewhat valuable and condition sensitive, I use penny sleeves inside Card Saver I. If they are really valuable I might go to Mylar holders. My vintage and vulnerable cards (paper cuts, etc.) are exclusively in Mylar holders; that's the standard material for Library of Congress preservation.
Last edited by Exhibitman; 06-25-2020 at 01:05 PM.
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