Pro Art Palette Plastic Folding Box Large - Contains: five notched holes for securely holding your brushes, five contained mixing areas to help you maintain vibrant colors, 24 color wells, and a fold out thumb pad for holding the palette comfortably in one hand while you paint. Hinged lid snaps shut for easy transport and opens to approximately 8.5"x 8.5".or wells, and a fold out thumb pad for holding the palette comfortably in one hand while you paint. Hinged lid snaps shut for easy transport. Folded size is approximately 5.5" x 12".