Pro Art Premier Sketch Book Hardcover 4"x 6" 70lb Wirebound 80 Sheets- Features sturdy black-leatherette cover that keeps artwork intact while providing a firm handheld drawing surface. Acid-free white sketch paper is suitable for all dry media and ideal for sketching, classwork, and writing. 70lb/114gsm Sheets are micro-perforated for easy removal. Spine is double wirebound with thick gauge coated wires for effortless 360 degree page turning. Paper is sourced from certified sustainable forests.