This HP All-in-One Printing Paper has been engineered to work in either inkjet or laser machines to help keep productivity up and costs down. It also meets HP's ColorLok Technology performance standard, a more advanced printing standard than ordinary plain papers that helps colors leap off the page as well as prevent smears. Created especially for both InkJet and LaserJet all-in-one machines. For every type of document produced. Formulated to help all-in-one machines produce crisper, sharper text and richer, deeper colors. Heavier, thicker and brighter than ordinary multi-use papers. ColorLok Technology for brighter colors, fewer smears, and bolder blacks. Acid-free for longer-lasting documents. Sold as single ream (500 total sheets).