ASTRA wax crayons are made using high quality raw materials. They have vivid and intense colors and excellent covering properties. They are resistant to breaking, do not crumble, do not release dust, or get your hands dirty. They do not require sharpening. Crayons allow you to draw smooth, uniform lines on all types of paper and on wooden and porous surfaces , e.g. asphalt or sandpaper. They are used in batik dyeing.