20 lb. basis, acid-free, versatile layout bond, printed with a non-reproducible blue grid on one side with inch squares accentuated. Smooth, opaque surface suitable for pencil or ink. Laser, copier, and inkjet compatible. Used by draftsmen, architects, and engineers for drawing diagrams, plotting mathematical functions, experimental data, etc. 50 sheet 17" x 22" pad. 4" x 4" grid.