Pentalic Illustrators Sketchbook features acid-free, cream colored, 60 lb. (100gsm) smooth surface paper. It is excellent for use with pencil, pen and ink, fine line or micron markers, ballpoint pens, and technical pens. Each hand made hardbound book has 192 pages, an elastic closure, a ribbon marker and a pocket in the back. Signatures are sewn in, and books will lay flat so the artist can draw across the page.