Made of durable, solvent resistant plastic. Features 33 wells and two large mixing trays. Lid has a built-in gasket system for an airtight seal and locks on all four sides. Lid also functions as a mixing tray. Second mixing tray measures 8.5"x 12.5". Bottom tray is divided into six mixing wells. Removable palettes include: three 4"x 4.19" featuring 7 wells each; six 4.75"x 4.19" mixing trays. Palette measures approximately 9.5"x 13.25".