Alvin Crayon Specialist 36/Pk Asstd Using these pastels ensures that your work will stay put when you're finished with it. With as much effort as you put into your artwork, you want to be sure that it won't peel away from the surface. With these pastels, you can draw to your heart's content on paper or canvas without worrying that it will flake, crack or peel from the surface. Each pastel uses pigments, wax and oil in an exacting formula that allows for smooth drawing and the use of many coloring and shading effects. These square pastels are well suited for drawing narrow lines, using broad strokes, doing finely detailed work and covering large areas with color. They are certified non-toxic by the ACMI and ASTM.