Kunst & Papier Stitch Bound Hardcover Sketch Book - Black Cover 4-1/4 x 5-3/4 Inch - These books are beautifully made by hand. They are stitch bound; not glue bound- so they lay flat when opened and do not lose pages. There are 160 pages per book. The paper inside is acid free, wood free, and bleach free. The weight of the paper is 100g. The paper has a slight cold press surface, making it ideal for pencil, pen and ink, and most writing pens.