Printworks - PRB04120 Horizontally perforated paper delivers consistent results to create high-quality prints and is compatible with business and accounting software. Letter-size paper is designed for use with all laser printers, inkjet printers, digital printers and copiers. Multipurpose design is perfect for printing invoices, billing statements, patient charts and more. Paper is perforated 3-2/3" and 7-1/3" from the bottom.