Value binder features a clear overlay on the front, back & spine to give you full control & flexibility over customizing presentations, organizational projects, office reports, class projects & more. Cover is made from polypropylene for increased durability when compared to PVC. Polypropylene is also nonstick to prevent the transfer of ink or lifting copy when materials are inserted in the cover or placed inside. This makes it easy to reuse & update the covers & spines as often as you'd like. 3" round rings with double boosters can hold up to 550 letter-size sheets with ease. Rings are mounted on the back lid to let pages lie flat & prevent wear-and-tear of the documents. Sleek, clean appearance with a no-rivet spine provides a professional look for your important documents.