This 100% cotton bristol is an industry standard. It has been the choice among sequential art professionals and award winning illustrations for years. Plate surface has an ultra-smooth finish that is unsurpassed for detail work using traditional pen and ink tools specialty pens specialty markers and airbrush. Semi-smooth is slightly textured. It is suited for pen and ink tools pencil specialty pens and markers. Vellum surface has a toothy finish that is excellent for graphite pencil colored pencil sketching sticks specialty pens and markers. It is also very good for charcoal pen and ink airbrush and light washes. Not recommended for traditional watercolor techniques. 11" x 17". Pads and packs have 24-sheets. Acid-free. 2-ply.