This cross section graph paper is printed in non-repro blue ink on layout bond; ideal for drafts people, graphic artists and creatives who prioritize precision and accuracy. Heavy blue lines define all square inch graph line divisions. Details:White with blue grid linesAvailable in multiple sizes4 x 4 squares per inch19lb /75 gsm50 sheetsUseful for creating scaled designs Grid is square with perimeter of paper Ink will not show with graphic arts cameras and copiersAcid free