Copic Bleedproof Paper is ideal for architects and designers making it perfect for layouts and renderings. A special coating on the reverse side keeps colours from bleeding through and keeps images clear and sharp. The paper is dimensionally stable and bleached "without chlorine" for optimum whiteness and is PH neutral. The layout paper in these alcohol-marker pads is so thin that you can trace images through each sheet. This A4 (210x297mm) pad contains twenty five (25) 70gsm sheets.