Grumbacher Mixed Media Paper Hardcover Sketchbook with "In & Out" Pages & Hidden Wire, 90 lb. / 185 GSM, 5.5" x 8.5", Side Wired, 40 White Sheets is a sketchbook designed for portability, durability and protection. This 90 lb. / 185 GSM, white heavy drawing paper with a medium tooth texture is perfect for dry media and light washes of wet media. With dual loop, wire-bound construction, this sketchbook 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. They can also be placed in any other Grumbacher and Koh-I-Noor wire-bound sketchbook. Made in USA