This sketchbook contains 160 pages (80 sheets) of 70 lb. (114 g/m2) acid free sketch paper that is suitable for all dry media. The sturdy and elegant, black leatherette texture cover keep your artwork and notes intact, while providing a firm hand-held drawing surface. Sheets are micro-perforated for easy removal. The spine is double wire-bound for effortless 360 degree page turning. Thick gauge, coated wires will not easily collapse. Paper sourced from certified sustainable forests.