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These are growing more popular. Some collectors like to proudly showcase their coins in archival folders, while others like air-tight capsules, or mylar-lined 2x2's. Whatever you choose, don't store yours in the soft flips you frequently find in the marketplace. These are comprised of polyvinyl chloride which decomposes over time and ruins the piece it was intended to preserve. If you acquire a coin already in one of these, move it ASAP to a better storage medium. You might consider Mylar, but recognize that these are brittle and may scratch the piece if it is not inserted and taken out with care. While they aren't airtight, they are choices for moderate value coins that will untouched for numerous a long time.
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