Designed to be stronger and more durable than basic binders, these 4 black binders feature a tear-resistant spine (DuraHinge) and more flexible, split-resistant edges (DuraEdge)Slant ring holds 20-30% more paper than basic 0.5 inch binder; 120-sheet capacityPages lie flat because rings are mounted on the rear binder panel instead of on the spineExtra storage with 2 interior clear pockets; all Durable binders are made with nonstick PVC-free material—no ink transferDurable view binder allows for customization on spine, front and back covers