Is a 20 lb. basis acid-free layout bond paper with an isometric grid printed with a non-reproducible blue grid on one side. The paper surface is smooth, opaque suitable for pencil, ink, and is compatible with copiers, injet & laser printers. The isometric grid has evenly spaced lines at 30°, 90°, and 120°, for drawing 3-dimensional objects rotated at 45°. Ideal for mechanical drawing or design needs for machine design, architecture, and patent office drafting. Draw sharp, dense images which will stand out on bright white background.