Yupo Paper Pads...Yupo is a unique alternative to traditional watercolor papers. It"s an incredibly durable stain-resistant non-absorbent synthetic paper that holds ink and watercolor with razor sharp precision. This extraordinary surface also resists tearing and buckling and it remains perfectly flat. Yupo"s ultra white color and super smooth finish makes all of the colors of the rainbow sing when applied to this revolutionary surface. Colors are brilliant and they lift off completely. It is an extremely forgiving sheet! This synthetic paper made of 100% polypropylene offers a unique alternative to traditional art papers. As a watercolor paper it has the advantage of being non-absorbent so colors lie on top of its surface producing brilliant vibrant effects. Colors retain their true clarity and brilliance. Yupo requires no soaking stretching or taping flat. Best of all it allows you to wipe off unwanted sections of your painting and start again with a fresh surface. Neutral PH hot press 74lb. 10 sheet pads- 100% Polypropylene.