Tim Holtz Alcohol Ink YUPO is a versatile surface especially suited for watercolor and mixed media techniques using Tim Holtz Alcohol Inks, Mixatives, and Blending Solution. YUPO is 100% Polypropylene; this white heavystock is a smooth, synthetic, ultra-heavyweight 144 lb surface; this non-absorbent substrate resists buckling and dries quickly. Not laser or inkjet compatible. Ten (10) sheets of white heavystock, 5 in. x 7 in. each