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. The 16K watercolor pad, 10” x 7” in size, perfect size to take with in travel. 【PREMIUM WATERCOLOR PAPER】 – 20 sheets of 100% cotton, textured, 140lb/300gsm cold pressed paper. 【ACID-FREE】Acid-free paper addresses the problem of preserving artwork for long periods and ensures the longevity of your artwork, perfect for the artists who are looking for the ultimate in permanence. 【TEXTURE】COLD-PRESSED finish has a light texture surface but provide strong scrub resistant, allowing for a variety of watercolor techniques. 【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.