About this item 100 Pack: These plastic binding covers have obtained the certificate of quality from UL. 8-1/2" x 11", suitable for letter size. 7 Mil PVC: Each binding cover is made from 7mil (180mic) PVC material. Plastic binding covers are long-lasting and sturdy that protect your persentation from bends and creases. Clear PVC Cover: These front binding covers can show the top page clearly to withstand frequent handling. Square Corner: Flush cut square corners give your work a neat presentation, 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.