green pressboard. Rigid 25 pt. stock. Great for a variety of organizational tasks! Sort files or paperwork chronologically with long-wearing pressboard guides. Self tabs preprinted with numbers 1-31. Global Product Type: File Guides-Preprinted Top Tab File Guides; Blank/Pre-Printed: 1-31; File Guides Type: Preprinted Top Tab File Guides; For Card/Sheet Size: Legal.