Canson Repositionable Illustration Paper Book, 150 Pound, 9 x 12 Inch, 25 Sheets Paper can be pulled Out and reinserted anywhere in the book without damaging Heavyweight paper that allows more ink and colors without damaging the paper's surface Bleed-proof and does not feather, making it ideal for use with pen, ink, marker, colored pencil, and pencil 25 sheets of 150 pound/250 gram acid free paper 9 x 12 size sheets