Business Source TopLoading Poly Sheet Protectors 33 mil Thickness For Letter 8 12 x 11 Sheet Rectangular Clear Polypropylene 50 Box Durable, toploading sheet protectors hold lettersize inserts without punching Printed materials do not stick or lift off this specially formulated polypropylene material Design features a reinforced strip at binding edge and threehole punched sides Diecut corners on ring side allow pages to turn freely Oversized ring binders and indexes are sold separately