Multipurpose paper is designed to run on small offset presses, large offset presses, copiers, laser printers & inkjet printers as well as plain paper fax machines that accept a higher basis weight. Acid-free design offers an added archival quality that extends the life of your documents. Smooth, level printing surface allows a proper ink holdout & dries quickly. 90 lb. Index meets USPS regulations for 7 point reply cards.