True "Gapless" binder allows pages to turn smoothly without falling out. Pages flow smoothly because patent-pending, one-piece rings have no gaps. Individual steel rings snap securely into their base and will not open when the binder is dropped. Back-mounted, locking rings can lie flat when not in use, which maximizes storage space and makes the empty binder easier to transport. 4" ring capacity holds up to 780 pages. Binder offers a label holder, exposed rivets and interior black pockets that each hold up to 50 sheets. Heavy-duty cover is made of sturdy, 32mm chipboard core covered by polypropylene.