Canson 180 Sketch Book 3.5" x 5.5". These elegant and versatile hard-bound black sketch books feature Coptic-style stitch binding that allows them to lay flat when open, affording simultaneous use of both open pages. They contain 80 pages of acid-free 65 lb. (96 gsm) French-made Crobart paper, excellent for use with dry-media techniques. The sketch books have rounded edges and a magnetic closure.