Set of numbered canvases are the most important part of paint by numbers. These canvases come with numbers that are printed for certain colors to be applied onto them. Their sizes and themes differ from a small portable set that can be used for painting while traveling to large canvases which can be worked on as detailed wall art. Each number is printed precisely, thus making it simple for the painter to paint to the design. Some sets do offer extra embellishments such as a color guide or a protective film to avoid the paint from smudging.