Top-loading design is sealed on 3 sides 3-hole punched to fit most standard binders. Load the sheet while the protector remains in the binder. Polypropylene material offers safe, archival-quality, no photocopy-transfer protection. Strong, reinforced binding edge prevents tears, even with heavy use. C-Line Sheet Protectors part of a large selection of office supplies. C-Line(R) Polypropylene Top-Loading Sheet Protectors, 8 1/2in. x 11in., Economy Weight, Box Of 100 is one of many Sheet Protectors available through Office Depot. Made by C-Line.