Ideal for school and office settings. Made with a patented antimicrobial paper treated to resist the growth of bacteria, mold and mildew that can cause stains, odors and product deterioration. Archival-quality. Scored for 3/4" expansion. 11 pt. stock. File Folder Type: Antimicrobial; Top Tab; Size: Letter; Folder Material: 11 pt. Stock; Color(s): Assorted.