Specially packaged Plus Pack includes four binders and one set of single-sided insertable five-tab dividers. Each Wilson Jones Heavy-Duty binder features an extra-durable hinge and is made of custom-formulated, PVC-free polypropylene. Lasts up to 10x longer than standard vinyl binders. Clear view covers and spine allow quick and easy binder customization. Four interior pockets for additional storage. Heavy-duty binders come with a one-year performance guarantee.