This Yupo Pad contains 15 sheets of 115gsm heavyweight Yupo paper, a unique synthetic paper that is waterproof, acid-free, and non-porous. Yupo paper is perfect for achieving great effects with alcohol inks, acrylics, and mixed media, as colours sit on the surface, creating vibrant, layered results. The smooth, non-absorbent surface allows you to easily wipe your work clean and start over.