Mood rings are always a popular gift or party favor. The color changes to indicate how your are feeling. These stainless steel mood rings are the perfect accessory for any outfit. The set of rings contain sizes 6, 7, 8, and 9. Made of stainless steel. Stainless Steel. Red strong emotions such as love, anger, extreme excitement. Yellow color of concentration. Blue very clam, relaxed, happy. White Boredom or frustration. Black tension, stress, nervous. Ages3+.