The beauty of these versatile hardcover sketchbooks is that pages can be removed for reworking or scanning, and then returned to the book for safekeeping! The Grumbacher Mixed Media Sketchbook holds 40 pages of white, 90 lb (185 gsm) "In & Out" mixed media paper with a medium tooth texture. Thanks to Grumbacher's dual loop, hidden wirebound Domelock technology, the paper can be worked on in the book, then removed and returned as often as necessary. The acid-free paper is sized for both dry and wet media.