Fossil Eraser is made of natural and non-toxic materials with glowing feature. The eraser can be kept in the box and reused again. Guideline - Take the amount of clay you want - Try them on the mold to make different shapes - Put the clay in the white box and add some water until covering all the clay. -Put it in the microwave using 600w for 3-5 minutes. A scented eraser is now ready to use.