Oil pastels crayons with foam surrounding the pastels. The dorso crayons lively colors were especially developped for the dorsing technique. With this technique you add color to the parchment paper using the dorso crayons and Dorso Oil (21804). The crayons are oil based. In the package you will find eight different lively colors. This assortment has yellow, orange, light blue, pink, red, lime green, dark blue, and purple.