The edges are seamed, and the underside (grey and white) is finished with a dense solvent, and water-resistant formulation that has excellent color-fastness.The palettes are easy to clean. Dried acrylic paint peels away, and dried oil paint can be removed with artist solvents or a single edge razor blade in a retractable scraper. The 9" x 12" and 12" x 16" products are designed to fit inside the Masterson Art Products Artist Palette Seal (blue lid) and the Sta-Wet (yellow lid and red lid) for storage and transportation. For use with all paint media as an artist palette, mulling surface, monoprinting surface, and craft surface. Made in Pennsylvania, USA.