Ultra Duty binders deliver top-notch durability, include four pockets and combine the strongest covers made by Wilson Jones with their best ring design. Extra-durable hinge and custom-formulated, PVC-free polypropylene covers make these binders nearly impossible to rip. The material lasts 10x longer than vinyl. D-Lock never-gap rings provide increased sheet capacity and spill-free security for your papers. Plus, for extreme Ease-of-Use single-touch triggers allow you to open all three binder rings with just one finger. Clear view covers and spine allow quick and easy binder customization. Five-year performance guarantee.