Most crayons are made of petroleum paraffin wax. Crayon Rocks are made from U.S.A. grown and processed soy wax. We combine this wax with other plant waxes and a variety of non-toxic powdered pigments to create beautiful colors. We use a natural ground rock to give the crayons their body. This creates a crayon that goes on smooth and blends easily and is, in many ways, much like an oil pastel.