The Grey Book features 55 lb. (120 gsm) acid-free light grey sketch paper, slim and ideal for taking on the road. It comes with enough reserves for many subjects. Smooth non-absorbent paper is well suited for working with India ink, fountain pens and acrylic markers as well as other water-based pens with minimum abrasion. Bound in several layers and thread stitched, all pages seat solidly and allow the artist to work on two pages across the center seam. The anthracite colored cover is nice to the touch and appears like precious wood. A red bookmark ribbon is included. 40 sheets (80 pages) per book.