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 Toned Sketch Art Books feature either Warm Tan or Cool Gray 80 lb. (118 gsm) medium-surface sketch paper. They are great for light and dark media, graphite, chalk, charcoal, sketching stick, marker, china marker, colored pencil, pen and white gel pen. The paper contains 30 post-consumer fiber and is 100 recycled. All books contain 128 pages.