Lettermark Punched & Perforated Papers with Perforations every 3-2/3" - White - 92 Brightness - Letter - 8 1/2" x 11" - 20 lb Basis Weight - 75 g/m² Grammage - 2500 / Carton - 2500 (500 - SFI - ColorLok Technology, Micro Perforated, Acid-free, Elemental Chlorine-free Lettermark Perforated Papers make it convenient and easy to create professional-quality documents. ColorLok technology produces bolder blacks and vivid colors with inkjet printing and better quality and performance with laser printing. 20 lb. paper works well with laser printers, desktop inkjet printers and copiers. Paper is microperforated every 3-2/3". Letter-size paper is perfect for forms, invoices, statements, coupons and more.