These hard-bound art books contain the same high-quality paper used in Strathmore fine art pads. Their lightly-textured matte covers are a dark chocolate brown and the durable Smyth-sewn binding allows pages to lay flat. The 400 Series Recycled Drawing Art Books feature bright white 80 lb. (130 gsm) medium-surface drawing paper. They are excellent for use with graphite pencil, colored pencil, charcoal, sketching stick, pen and ink, marker, soft pastel, mixed media and oil pastel. The paper contains 30% post-consumer fiber and is acid-free.