Kunst & Papier Binderboard Sketchbooks are one of our best-selling sketchbooks! These are sturdy, high-quality hardcover sketchbooks that can be covered with bookcloth or paper, painted, or collaged. The linen spines are smyth-sewn and gauze-spliced to provide strength and durability — the books can be opened flat and even bent back double without damage to the binding. The heavyweight acid-free paper is excellent for all dry media and is suitable for water-based markers and light washes. Paper is pH buffered and and lignin- and chlorine-free. You will love these sketchbooks!