Isometric drafting paper by Seth Cole and Clearprint. Isometric grid drawing paper is 20 lb. basis, acid-free, versatile layout bond. Printed with a non-reproducible blue grid on one side. Smooth, opaque surface suitable for pencil or ink. Ideal isometric drafting paper for mechanical drawing or design needs, especially machine design, architecture, and patent office drafting. Isometric grid of evenly spaced lines at 30, 90, and 120-degrees, for drawing 3-dimensional objects rotated at 45-degrees. Ideal for pipe, sheet metal, HVAC layouts, cabinet and structural design. Laser, copier, and inkjet compatible. Quality-made in the USA.