Kolo Sketch Books feature a natural white, lightweight sketch paper with a fine tooth surface. Each book contains 100 sheets (200 pages) of 50 lb/74 gsm sketch paper. Sheets are actual size when removed from the wire binding. Kolo sketch paper is ideally suited for experimentation, practice of techniques, or quick studies with a variety of dry media. The high surface strength helps prevent ghosting and surface disruption while erasing. All Kolo art paper is acid free, ensuring the longevity of your art. The fine tooth surface of Kolo sketch paper provides a perfect choice for quick studies with pencil, colored pencil, charcoal, or sketching stick. You want your artist books to be durable, so we built them to last. In addition to premium paper, each book is constructed with an ultra-thick front and back cover, and enclosed with a durable, bronze double-wire. The cover's rounded corners make it easier to place in your bag. Kolo is committed to saving our environment. That's why 1% of our Artist Book sales go to non-profit organizations in Africa working to save the great wild animals that are in peril.