Tim Holtz Alcohol Ink YUPO is a versatile surface specially 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 86 lb surface that resists buckling and dries quickly. This non-absorbent substrate resists buckling and dries quickly. Not laser or inkjet compatible. Five (5) sheets of white heavystock, 8 in. x 10 in. each.