Strathmore 500 Series Mixed Media Board is made with internally sized sheets with a durable vellum finish mounted to both sides of a high quality white board. Excellent for watercolor, gouache, acrylic, graphite, pen and ink, colored pencil, marker, pastel and collage. 100% cotton surfaces. Archival, lignin free and acid free. Made in the USA. 52 pt. Size 16x20