50 Pack: These plastic binding covers have obtained the certificate of quality from UL. 8-1/2" x 11", suitable for letter size. 8 Mil Polycover: Binding presentation covers are made from Polyethylene Terephthalate (PET). Non-toxic, tasteless, and safe. Ultra Clear: Long-lasting binding front covers are more transparent than PVC binding covers, show the top page more clearly. They are designed to hold up against frequent use, protect your persentation from bends and creases. Square Corner: Flush cut square corners give your work a neat presentation. Plastic Binding covers are water-proof and tear-proof to keep your presentation clean. Unpunched for Easy Use: Unpunched binding covers can be used with any binding spine, in any binding style that suits your needs.Work with any binding system (Attention: Except Thermal). They are well-suited for use in school offices or at home, making them a great gift for teachers, students, and colleagues. Binditek 50 Pack 8 Mil Binding Presentation Covers, Ultra Clear Binding Front Covers, 8-1/2 x 11 Inches Report Covers, Letter Size, Square Corners, Un-Punched, for Students and Coworkers