>>47256011O rings are only bad once you get into the huge 3", 4" rings. When the diameter of the ring is large enough, the pages can get caught in between the bottom of the ring and the binder. When cards are improperly handled, and the binder is closed when these pages are stuck under the O ring, it causes ring dents in the cards.
Only a problem if you're using giant binders to store a huge amount of bulk, and if you're flipping through like an idiot. For reference, I have a binder with 1800 commons and uncommons in ultra pro pages, it is 15 pounds, and I cannot dent any of the cards if I tried. It's seriously only an issue for card shops.
