BAOHONG Academy Watercolor paper is made from 100% cotton. It is 140lb/300gsm. Watercolor papers made from cotton would hold more color and with perfect water absorption. The heavyweight watercolor papers is acid-free and chlorine-free, pH-neutral and archival, durable. BAOHONG Academy Watercolorpaper is strong and durable for whether wet, dry or mixed media painting, and less likely to curl or warp. The Cold-pressed watercolor papers have a slightly textured surface, which is between that of rough and hot-pressed papers, allowing for a variety of watercolor techniques. 20 sheets per pack and all these papers are glued bound for easier tearing off, and a hardboard underneath for better protection and control. Academy grade watercolor block is ideal for beginning artists, students practice and art exams, a great gift for watercolorists and enthusiasts. Compared to other watercolor papers which are not made from 100% cotton, these cotton watercolor papers are both in high quality and reasonable price, whether you are painting with watercolor paints, markers, pencils, ink, charcoal for painting, sketching, printmaking or drawing, these papers would provide an optimum performance and deliver extraordinarily brilliant colors.