Grumbacher Watercolor Paper Hardcover Sketchbook with In and Out Pages and Hidden Wire, 140 lb. / 300 GSM, 7 x 10 Inches, 30 White Cold-Press Sheets, 460600663 Made in USA sketchbook is designed for portability, durability and protection 140 lb. / 300 GSM Cold Press watercolor paper Contains optimized sizing level to ensure good wet and dry lifting 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