Repeatedly use our durable metal prongs with your medical charts and office files without worry of breaking of prongs or coming detached from the folder (LETTER SIZE) Perfect for storing over 100 files or larger bulky files with our durable 4 section classification folder with thick 25pt blue press board, 17pt Kraft paper divider, and strong 2’’ Tyvek expansion Quickly and easily organizing your standard letter size client files, medical patient files, or office files Perfect for use in a color-coded file system in your classroom, law office, or business office with our bright blue paper stock.