Durable, top-loading sheet protectors hold letter-size inserts without punching. Printed materials do not stick or lift off of this specially formulated, polypropylene material. Design features a reinforced strip at binding edge, 2.4 mil thickness and three-hole punched sides. Die-cut corners on ring side allow pages to turn freely. Oversized ring binders and indexes are sold separately.BSN32356. 32356. Business Source Business Source Top Loading Sheet Protector.