Description: The uncompromising, durable build of these heavy-duty binders is enhanced by clear view covers and spine. Featuring our strongest covers, and made of our custom formulated PVC-free polypropylene, these binders last up to 10X longer than ones made of vinyl. Extra durable hinges. Heavy-duty binders also feature never-gap rings for secure and snag-free paper storage. Includes two interior pockets.