Grumbacher Mixed Media Paper Hardcover Sketchbook with In and Out Pages and Hidden Wire, 90 lb. / 185 GSM, 5.5 X 8.5 Inches, Side Wired, 40 White Sheets, 460700663 Made in USA sketchbook is designed for portability, durability and protection A 90 lb. / 185 GSM, white heavy drawing paper with a medium tooth texture Perfect for dry media and light washes of wet media Dual loop, wire-bound construction and features “In & Out” pages (patent pending) that allow you to remove sheets from the sketchbook for painting, reworking, scanning, and more Upon completion, simply return the sheets into sketchbook and can also be placed in any other Grumbacher and Koh-I-Noor wire-bound sketchbook