Endless Ring Original Band Mood Ring. This magical mood ring can tell how your feeling simply by making contact with you skin. How does it does this has been the cause of much schoolyard controversy but since the ring changes color because of thermo-reactive liquid crystal we have to assume it change because of fluctuation in temperature.. all that aside, as your mood changes so does your body temperature. This ring picks up on that temperature change and the ring changes color along with your mood! Awesome! Ships individually in assorted sizes.