Cotton Paper: Watercolor sketchbook is made from cotton paper for outstanding durability and stability, suitable for professional artists and amateurs. Double Sided: The paper has different textures on both sides, including fine, medium and coarse texture options to meet the needs of different painting styles and techniques. No Acid: The watercolor paper has been specially treated to meet the neutral standard, which can effectively prevent the paper from yellowing or aging over time, making your work last a long time. No Bleach: The watercolor paper retains the natural color and texture of the paper, environmentally friendly, ensures the safety of the paper, and is suitable for a variety of artistic creations. Good Halo Effect: The thickened paper can absorb water quickly, so that the pigments are evenly distributed without bleeding or piling up. The color mixing is natural and smooth, and the halo effect is excellent.