Pentalic Nature Sketch Drawing Pad - Heavyweight 130#, 211gsm, 25% cotton sheet has a toothy, rough vellum surface on one side and a smooth surface on the other. 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. A percentage of all Nature Sketch sales will be donated to the American Wildlife Fund located in Molalla, Oregon.