Lettermark Copy Paper features ColorLok technology to deliver vivid colors, bold blacks, a faster drying time & elevated print quality. Smooth construction is 99.99 percent jam-free on high-speed digital printing equipment. Acid-free material prevents yellowing over time for long-lasting brightness. 20 lb. paper works well with laser printers, desktop inkjet printers & copiers. Letter-size paper is perfect for memos, newsletters, flyers, reports & more. It meets Sustainable Forestry Initiative (SFI) certification standards.