Bring your ideas to life with this Derwent Academy Heavyweight Paper Sketchbook. Its topbound, heavyweight pages are perfect for sketching with dry mediums and perforated so you can cleanly tear out your best work. This sketchbook features heavyweight 67lb acid-free paper. The pages easily flip back and lay flat while you work. Spiral Lock technology ensures the binding won't snag or uncoil over time. Each book includes 70 white sheets.