Professional quality sheets & boards designed to accept both wet & dry media, providing the ultimate surface for mixed media. Durable vellum finish for traditional drawing techniques & internally sized for wet media. 100% cotton fiber, archival, lignin free & acid free. Withstands multiple layers of watercolor, gouache, acrylic, graphite, pen & ink, colored pencil, marker, pastel & collage. The history of Strathmore Paper Company began on St. Patrick's Day in 1892 when its founder, Horace Moses, opened the Mittineague Paper Mill in West Springfield, MA. Strathmore has been a leading supplier of fine art papers for 130 years & founded with the belief that better paper makes better art. Strathmore provides artists of all levels with one of the widest ranges of quality surfaces for producing beautiful works of art, no matter the choice of medium. Listening to the needs of artists & providing inspiration, education, & innovating new products is at the core of what matters to Strathmore. The Strathmore 500 Series contains premium quality, professional grade fine art papers. Used by museum-endorsed artists throughout the world, these surfaces are specifically created with cotton fibers for enhanced durability, longevity & exceptional creative experiences. All papers are archival quality & acid free, so artists can confidently create pieces that will go through the most rigorous critiques & valuations.