Anupam Sketch-O Book A3, A4, and A5 Spiral Bound uses the premium surface drawing paper good for most mediums, including charcoal, watercolors, acrylic paint, ink or pencil. Anupam Sketcho fine art drawing paper is best for sketching, drawing, manga, cartoons, still life, stippling and practicing new styles. It has durable, Acid-Free Paper. Its sketch paper is strong, smooth and absorbs colors and lines more readily, reducing blotching and smudges.