Professional quality paper is internally sized for wet media with durable vellum finish for drawing techniques. 100% cotton fiber acid-free lignin-free and archival. Suitable for watercolor gouache acrylic graphite pen & ink colored pencil marker pastel and collage. Velvety soft cover in rich dark brown with Smyth-sewn binding to allow book to open wide and lay flatter. 90 lb./190g. 64 pages.