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WesleyUltra-Pro does make rigid sheets specifically for PSA and Beckett holders. The slabs snap right into the sheets. As Josh mentioned, these pages are very very thick. At most you can hold 24 cards in MJ Roop's largest binder. Another problem is that the sheets stick to one another. It was such a hassle to unstick the pages that I gave up using the Ultra-Pro pages and simply gave them away.