Pentalic Wirebound Heavyweight Sketch Book has 160 pages (80 sheets) of 70 lb. (114 gsm) acid free paper that is excellent for sketching, classwork and writing. Sturdy front and back covers provide a firm drawing surface that is excellent for hand-held usage while the thick-gauge wire binding resists collapsing while allowing 360 degree page turning. Sheets are micro-perforated for easy removal. Cover is finished with an embossed leatherette texture.