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<p>[QUOTE=&quot;Cliff Reuter, post: 7909435, member: 115140&quot;]I no longer use cardboard flips but many people do and I like to be as accurate as possible with my understanding. (I realize Saflips offer only a certain level of protection as well. But when factoring in cost, storage, availability, etc. they are what I have settled on for most of my coins.)</p><p><br /></p><p>So, are you saying the gasses can penetrate the plastic (Mylar) on the cardboard flips? (Even though the plastic itself seals against the rims/surface of the coin.)</p><p><br /></p><p>Thanks in advance for your knowledge, insight, and experience.[/QUOTE]</p><p><br /></p>

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