This portable premium sketchbook offers acid free, medium surface, unlined paper with a durable waterproof cover. It is perfect for media like pencils, pastels, charcoal, and pen. The spine is double wire-bound with thick gauge coated wires for effortless 360-degree page turning. Details: White 6" x 9" 70 lb. / 114gsm 75 unlined sheets Double wire-bound Acid-free paper Waterproof cover For use with dry media