Archival-safe sheet protectors for three-ring binders offer the crystal-clear clarity of PolyGlass polypropylene material and texture-free surface unlike any other pocket before. Crystal clarity ensures your images shine through like you're looking through glass. Unique, rigid spine weld is designed for easy insertion of photographs, digital images and artwork. PolyGlass 3-Ring Pocket Sheets fit standard 3-ring binders and popular screw post presentation books and feature acid-free black paper inserts. They will not stick to inkjet, laser or copier toner.