Wilson Jones Heavy Duty Binders are made from polypropylene, a neutral plastic that is extremely durable. These binders have D-rings that hold up to 25% more paper than round ring binders, and last ten times longer than a comparable binder made of vinyl. Polypro is PVC Free and recyclable.When you are looking for a binder that will last, Heavy Duty is the easy choice. Traveling back and forth from school, work, and home can be rough on the things in your backpack or briefcase, jostling your supplies around. A Heavy Duty Binder keeps papers safe and protected so the time you spent organizing doesn’t go to waste. you can rest assured that this binder will meet your needs. Extra Durable HingeNew look of the binder spine shows off the durable, rugged build. Reinforced to keep binder from falling apart.Strongest CoversPolypro lasts 10X longer than vinyl and is virtually impossible to rip or tear.Color SplashBinders in every color make it easy to find one that matches your taste.2 PocketsOne pocket on the inside of each cover is perfect for quick storage of loose sheets. You May Also Be Interested In:D-ring binders provide more storage space. Compared to a same size round ring binder the D-ring version will hold 25% more paper. This higher sheet capacity ensures that you will have the room you need for all your important paperwork. Plus, you get all the same Ultra Duty features including easy to open single touch rings. Accessories:Your one stop shop for everything Wilson Jones. Make the most of your binder with dividers, binder apps and other useful accessories. Dividers Sheet Protectors Binder Apps Heavy Duty Binder – 4 Pack