The Fluid 100 Hot Press 140 lb (300 gsm) Easy-Block contains 15 sheets of premium, archival 100% cotton watercolor paper bound on two sides. Unlike any other, Fluid 100 is made by European mill masters who have combined their traditional paper making techniques with modern technology. The process has resulted in beautiful, acid-free, natural white sheets that are strong with a smoother surface. The gelatin sizing allows an artist to have greater control, producing brilliant and intense color. Paint directly on the Easy-Block without the need to wet or stretch. Please note that paint dries very quickly on Hot Press paper, making it ideal for large, even washes of color. MADE IN USA.