The Strathmore 500 series papers are the highest quality papers in the Strathmore paper line. This line of premium marker pads are crafted with cotton fibers to insure enhanced surface durability and exceptional marking results. These paper are acid-free and of archival quality. The Strathmore 500 series marker paper is semi-transparent and is designed to accept heavy coverage from felt-tip markers without bleeding. They are perfect for professional artists and illustrators. Available in 3 different sized pads.