If you're looking for a binder that is stronger, lasts longer, and can hang tough with even the most demanding activities, look no further than this 4 pack of Avery Heavy Duty 2 inch binders in white. The sturdy exterior features a tear-resistant spine (DuraHinge) and more flexible, split-resistant edges (DuraEdge). Heavy Duty binders are also fully adhered with a deep-weave polypropylene cover that is resistant to bubbling, surface wrinkles, and is tear-resistant.