The uncompromising, durable build of HeavyDuty View Binders with ExtraDurable Hinge is enhanced by clear view covers and spine Featuring Wilson Jones' strongest covers and made of Wilson Jones' customformulated, PVCfree polypropylene, these binders last up to 10 times longer than ones made of vinyl and are better for the environment Heavyduty binders also feature nevergap rings for secure and snagfree paper storage Three nevergap round rings provide spillfree document security Customizable cover and spine simplify binder labeling and personalization Two interior pockets provide space for additional documents