6Innovation meets sustainability, durability and performance. 20 Blank waterproof and tear resistant sheets, made by Stone Paper - a Tree free paper company making paper products from mineral content. 100% tree free, waterproof, grease proof, fire proof, low carbon footprint notebook that feel amazing and writes beautifully.Acid free, heavy weight, For finished artwork - wet and dry media, Great for watercolor, inks, and acrylics, Made with 80-85% calcium carbonate mineral and acid free non-toxic resin