Our watercolor palettes are made from 2 mm thick polypropylene and are designed to be used with Altenew watercolor paint, our Crisp Dye Ink, or any other water-based media. The light-colored surface ensures an accurate representation of your paint color and is smooth and sturdy - perfect for your artistic needs! Measures 8.5"x11". Will not warp with moderate heat applications. To clean simpley wipe down with a damp cloth.