Canson Universal Art Book, Blank Acid Free Paper with Pocket, Elastic Closure and Stitch Binding, Hardbound, 65 Pound, 4 x 6 Inch, 112 Sheets Contain high performance paper that is acid free Feature an elastic closure, stitch binding with small signatures to help the book lay flat, and an expandable pocket inside the back cover Contains 112 sheets of 65 pound/96 gram Acid free 4 x 6 inch paper