These pads contain 100% cotton Arches watercolor paper in a cold press surface. This 140 lb paper is gelatin-sized and then air dried so that colors used retain a fine rendering, even after that surface has been scraped and erased. Its natural whiteness (no optical bleaches), mildew protection and neutral pH mean ensure the best for your artwork. Arches watercolour paper is renowned for it's excellence and is wonderful for use with watercolor, gouache, pen and ink, acrylics or calligraphy. Two convenient sizes, each pad is top tape bound and contains 12 sheets.