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 with good erasing qualities. Laser, copier, and inkjet compatible. Commonly used by draftsmen, architects, and engineers for plotting graphs, drawing diagrams, statistical data, etc. 4x4 grid. 50-Sheet Pad, 17" x 22".