Crayons are used for drawing and writing. They can be made of chalk, colourful pastel, charcoal or other materials. Most frequently they can be divided into three kinds: pastel, wax and pencil. These last ones have a wooden case, inside of which there is coloured charcoal. Crayons are most often used by children as the crayons are non-toxic and easy to use. What is more, a wide range of crayon colours is available, which pleases children. Artists do not use crayons for drawing as it is too difficult to mix the colours of crayons.