A cotton fabric bag filled with Crayon Rocks in beautiful colours. 32 colours assorted Shape The environmentally friendly Crayon Rocks pens made of soy wax have a special ergonomic shape to promote the three-finger grip, the important grip for writing. Material Crayon Rocks, produced under strict conditions in the USA, are made from natural soy wax. They owe their colour to mineral pigments and are therefore particularly ecological. Painting The colours of the Crayon Rocks are natural and lively. The wax crayons can also be applied in layers one on top of the other, resulting in beautiful shades of colour that blend into each other. For the Crayon Rocks a kosher soy wax, which is planted and processed in the USA, is used. The colourants for the pencils are extracted from minerals and the filling of the Crayon Rocks consists of natural limestone. They, therefore, contain no toxins or softeners.