Heavyweight 130#, 211gsm, 25% cotton sheet has a toothy, rough vellum surface for the fine artist. Extremely creamy paper is suitable for pencil, charcoal, ink, acrylics, pastels and oil pastels, watercolor pencils, watercolors (light washes) and tempera. Heavyweight chipboard back allows field use without buckling. Side black plastic spiral bound. 50 sheets per pad. A percentage of all Nature Sketch sales will be donated to the American Wildlife Fund located in Molalla, Oregon.