This 10 by 10 inch 140lb coldpress Stonehenge Aqua pad is made of 100% Black cotton fiber and includes 15 sheets. The first 100% cotton paper to be sized for watercolor it gives the foundation for transforming negative space into positive as you build up light using metallic and pearlescent watercolor paints, pencils, pens, markers and inks. Developed as a high-performing, cost-effective paper for watercolorists, this buckle-resistant and extremely durable sheet will bring a new breed of creativity to light.