Product Description Designed to last, Avery 79584 Heavy-Duty Red 4 Inch Binders are perfect for long-term storage and everyday use. Created with durable, non-stick polypropylene, Avery Heavy-Duty Binders are built to defend your documents from everyday wear and tear. Our DuraHinge technology helps avoid tearing along the spine and our DuraEdge technology makes the sides more pliable to resist splitting. The wide front and back panels are great for protecting sheet protectors and divider tabs. The 4 inch rings use our EZD design that opens with ease and can keep up to 780 pages secure. EZD rings can also hold up to 50% more sheets than round rings of the same size. The binder rings are mounted on the back cover to keep your pages flat to avoid creasing and for easy flipping. Four interior pockets are included to store loose sheets and extra documents. Whether you need binders for school, a presentation binder or a trading card binder, organize your next project with Heavy-Duty Avery Binders. From the Manufacturer Heavy-duty binder features One Touch EZD locking rings that open with ease and keep pages secure. Gap-Free ring design prevents gapping and misalignment of rings. Pages lie flat with these back-mounted rings. EZD rings hold up to 50 percent more than same-size round rings. Wide front and back binder panels fully cover standard dividers and sheet protectors so you can keep your letter-size paperwork and tabs protected. Binder also has exposed rivets on back and a sturdy chipboard core. Four durable, clear interior pockets store handouts and loose or unpunched pages. Each pocket holds up to 40 sheets. Cover material is PVC-free polypropylene.