Make your open-shelf filing system work for you with color coding. Colorful folders have reinforced double-ply end tabs that stand up to frequent use. Tabs with scored lines for easy label placement. 11 pt. stock. Acid-free. This product was made using wood sourced from a certified managed forest. File Folder Size Type: Letter; File Folder Color: Blue; Color Family: Blue; File Folder Material: 11-pt Stock.