This Harmony Watercolor Spiral-Bound Pad is especially suited for wet painting techniques such as watercolor, glazing, mixed media, gouache, tempera and acrylic. Surface sizing increases the durability and resistance of the paper, permitting corrections while your project is still wet; the strength of this paper also means that masking fluids or masking tape can be used and removed residue-free, without damaging your artwork.140 lb. (300gsm) natural white paper, 12 sheets per pad, Acid-free, light resistant and eraser-resistant paperDetails: Natural white Available in multiple sizes 12 sheets 140 lb. (300gsm) paper Acid-free Spiral-bound Light resistant and eraser-resistant