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I can confirm I've had expensive cards sitting in these binders since they were first released a few years ago with little movement and all are fine. At the time, I worked at a shop were the Monster binders and a few other manufactures' products experienced the issue - the Ultra Pro did not. I believe heat is a major cause of the PVC to react in such a way and it can occur even when empty and still sealed. Ultra Pro binders do not contain PVC, but if concerned, be sure to double sleeve your cards and keep the binders somewhere cool and dry.