Sturdy pockets made from heavy duty perforated sheet metal and designed to fit a standard 3 ring binder. Stays closed when you put the leaves in a folder and then turn them over (why would anyone but me do that?). Used them to hold flash drives but could use them for anything that fits in 3" x 3.5" pockets. I wish they were available in smaller quantities but happy with the purchase and the quick shipping.
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