Alvin 11" x 17" isometric 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. Laser, copier, and inkjet compatible. Pad of 30 sheets. Alvin 1242-2 isometric drafting papers are made in the USA.