【12 Mil Polycovers】Each binding cover is made of 12mil (300mic) of Polypropylene material, midweight. Compared with paper binding covers, these poly binding covers are more sturdy and long-lasting, protecting your documents from creases and tears. 【Letter Size】These 100 pack plastic binding covers are ideally sized to align with 8-1/2 x 11 inches paper, making them ideal for protecting important report with a precise fit. 【Sand-Textured】These plastic binding covers feature a sand textured surface for a comfortable grip. Certified by quality test reports, they can withstand frequent use. 【Square Corners】Flush cut square corners give your work a neat presentation and they're water-proof and tear-proof to keep your papers clean. 【Unpunched for Versatility】Unpunched binding covers can be used with any binding spine, in any binding style that suits your binding needs. Compatible with any binding system (except thermal). They are well-suited for use in school offices or at home, making them ideal for teachers, students, and colleagues. Each Binditek binding cover is made of 12 mil (300mic) of Polypropylene material , midweight, Compared with paper binding covers, these poly binding covers are more durable and sturdy that protect your documents from spills and tears. The 12mil letter size Sand-Textured Polycovers covers can be used in home, office, workshop or classroom for keeping your files durable. When you need to make an impression or ensure that the contents of your important presentation are protected,Binditek offers an affordable and high-quality solution. The 12mil letter size Sand-Textured Polycovers covers Sheets have been designed to protect your business reports, proposals, and other important documents. We’ve designed these document covers with Sand-Textured to be both durable and elegant. 12 Mil Polycovers: Each sheet is made of 12mil (300mic) of Polypropylene material, midweight. Compared with paper binding covers, these poly binding covers are more sturdy that protect your documents from creases and tears.