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.