The OEM Cardinal OneStep Printable Table of Contents and Dividers set includes 12 dividers designed for easy customization. This index system allows you to create custom index sets by printing onto the included Table of Contents sheets. The matching, preprinted monthly tabs on the divider sheets can be used in either vertical or landscape formats. Tabs and ring edges are reinforced for durability, making them suitable for heavy use. These three-hole punched indexes are compatible with laser or inkjet printers, as well as standard typewriters.