TOTiyea Plastic Binding Presentation Covers Sturdy and Elegant binding covers TOTiyea Poly Binding Covers give a professional look and feel to any document. Each cover is made of high-quality polyethylene that will hold up against frequent use. Compared with paper binding covers, these poly covers are more sturdy and could protect your documents from spills and tears. Un-punched covers adapt to most of the binding systems. (Notice: Not compatible with thermal-binding systems.) They will impress your prospective customers or business clients when you give them pitches. They can also be used for kids' school art projects, homeschooling textbooks and more.