Canson Repositionable Mix Media Art Book Paper Pad, 150 Pound, 9 x 12 Inch, 30 Sheets An arrowhead, wire bound system which allows one to remove and reinsert the pages Two-sided paper with fine tooth on one side and a medium tooth on the other Excellent for a variety of wet and dry media Excellent erasability making it ideal for final works 30 sheets of 150 pound/250 gram acid free 9 x 12 inch paper