BAOHONG Artists‘ 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 Watercolor paper is strong and durable for whether wet, dry or mixed media painting, and less likely to curl or warp. The Postcards in a box have multiple texture papers for artists to paint. - Textured Cold press x 16 pcs 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. - Smooth Hot Press x 2 pcs Hot-pressed watercolor papers come with a smooth surface which is ideal for painting fine details, and watercolor papers made from cotton would hold more color and with perfect water absorption - Rough x 2 pcs The rough finish has an effect close to that of handmade paper. This rough grain helps to achieve valuable effects of texture 20 sheets per box for you to try out three different textures of the BAOHONG Academy Watercolor Papers! The postcards box, 4”x 6” in size, perfect size to take with in travel. 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.