This is an original OEM C-line polypropylene top loading sheet protector, sold in a box of 50. Designed with a top-loading feature and sealed on three sides, these protectors allow for easy insertion of sheets without the need for punching. They fit standard three-ring binders and are made from archival-quality polypropylene, ensuring safe storage without photocopy transfer. The strong, reinforced binding edge provides durability, preventing tears even with heavy use.