Heavy-duty view binder offers sturdy construction to prevent cover from tearing or cracking. Design features an extra-durable hinge and custom-formulated, PVC-free polypropylene. Polypro binder is eco-friendlier than vinyl binders and lasts up to 10 times longer. Three never-gap round rings provide spill-free document security. Clear view covers and spine allow quick, easy binder customization. The 1 binder holds 550 sheets and has two interior pockets for loose documents.