Each of these wire bound sketch books has 160 pages (80 sheets) of 70 lb. (114 gsm) acid free sketch paper. Sturdy and elegant front and back covers with linen texture keep your artwork and notes intact while providing a firm handheld drawing surface. Sheets are micro-perforated for easy removal. Double wire bound strength for effortless 360 degree page turning. Thick gauge, coated wires will not easily collapse. Paper sourced from certified sustainable forests. Excellent for sketching, classwork and writing.