These colours are very smooth and soft and easy to rub on paper and they give a very nice tone.
They want a better preservation because they are very soft so they break easily.using this type of colours you will be easily able to make a good drawing and they are better for children who are below 10 years of age.
They gives a very good effect in the drawings and tone.
Do not release wax and clot at a place like oil pastels or wax crayons.