BAOHONG Watercolor Block is made of 100% cotton Watercolor Paper 140lb/300gsm, Artists’ Grade Watercolor Paper. 【MATERIAL】Made from long, 100% COTTON fibers, allowing it to absorb a lot of water without warping or causing the colors to bleed. 【TEXTURE】COLD-PRESSED finish has a light texture but provide strong scrub resistant. 【CONTENT】One block with 20 sheets of 140lb/300gsm watercolor paper and is glued on four edges to eliminate the need for stretching and avoids cockling. It is heavyweight – 140lb/300gsm. Watercolor papers made from cotton would hold more color and with perfect water absorption. The heavyweight watercolor papers are acid-free and chlorine-free, pH-neutral and archival, durable.BAOHONG Artists’ Watercolor paper 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, with four edges glued, and a thick cardboard on the back for artists to carry everywhere with better protection and control BAOHONG Artists’ grade watercolor block provides the best-value 100% cotton, 140lb/300 gsm watercolor paper for beginning artists, students to use in their daily practices, and art exams. A perfect gift for the watercolor lovers! . 100% cotton watercolor papers are both in high quality and reasonable price, compare with other named brand watercolor papers. Whether you are painting with watercolor paints, markers, pencils, ink, charcoal for painting, sketching, printmaking or drawing, these papers would out-perform and deliver extraordinarily vibrant colors.