It would be nice to have a protective page that is semi-rigid and that locks the cards into place. The thicker material is better because when you have four slabs in a 4-pocket sheet you usually have to replace the sheet pretty quickly for wear and tear. That's why I took my slabbed cards out of albums. With these pages I could probably return to using catalog binders (the 6" wide ones) for slabbed cards. Would greatly facilitate viewing.
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