Seth Cole "Big Book" art sketch books feature premium-quality, 60 lb.-89 gram sketch paper. Heavy-weight, acid-free paper with light texture is the artist's best choice for charcoal, pastel, pencil, or pens. Identical to Strathmore's #400 series sketch paper. Available in heavy-duty spiral-bound books and tape pads with durable heavy-weight chipboard back cover. Choose from 33, 55, or 110-sheet pads. Seth Cole sketchbooks are made in the USA.