Or pages that stick to each other. PVC almost always does that until it dries out and gets brittle.
They might be ok, but the only unmarked pages I can recall were some very inexpensive PVC ones, and some made from decent materials but really thin and not great quality that came in either beginners kits or as add-ons to those kits usually available in places like K-mart. (I think they may still be around, probably as pokemon card pages)
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