These Strathmore 400 Series Toned Sketch Paper pads feature 100% recycled, acid-free toned sketch paper. This paper is great for light and dark media, including graphite, chalk, charcoal, sketching stick, markers, china markers, colored pencils, pens, and white gel pens. These pads are wire bound with a micro-perforation, which allows you to keep the sketches as actual size sheets for display or future reference. Pads come in a variety of sizes, and contain 30% post-consumer fiber.