The Pentalic Watercolor Field Book holds 24 sheets of acid-free, 140 lb (300 gsm),cold press watercolor paper. Wirebound on the short side, the paper is ideal for capturing panoramic landscapes and seascapes with watercolors and drawing materials, especially across a two-page spread. The books are double wirebound for effortless 360 degree page-turning. The sturdy front and back covers offer a firm surface and have a lightly stippled texture. The thick gauge coated wire will not collapse. The paper is sourced from certified sustainable forests.