Strathmore 500 series mixed media features professional quality paper that is internally sized for wet media with a durable vellum finish for drawing techniques. Excellent for watercolor, gouache, acrylic, graphite, pen & ink, colored pencil, marker, pastel and collage. 100percent cotton fiber, acid free, lignin free, archival, 90lb paper. Durable smyth-sewn binding allows pages to lay flatter inside the lightly textured, matte Dark Chocolate brown cover. This item is manufactured in United States.