YUPO Heavy Pads are produced with the heavyweight 144lb (390g) YUPO white - a slick, smooth, non-absorbent synthetic (polypropylene) substrate that dramatically changes the way you paint, print or draw. The rigid, heavyweight nature of the paper makes it ideal for on-location plein-air painting. Its bright white surface gives artists the flexibility to work in several different mediums to achieve unique and creative results. For watercolor applications the surface may be wiped clean to restore the original white of the sheet. Applications include watercolor, alcohol inks, pen & ink, silkscreen, debossing, drawing, acrylic painting, and more.