Professional quality paper is internally sized for wet media with durable vellum finish for drawing techniques. 100percent 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. 6. This item is manufactured in United States.