Prolong your life, increase your memory, and gain vital positive energy! The Boading Iron Ball or Chinese Health Balls have been known to stimulate the various acupuncture points in the hand. This type of exercise with the magic health balls can prevent and cure stress, relieve fatigue, and improve general health. By using these Chinese Balls all the joints in the hand and forearm muscles are contracted and relaxed harmonically. Our Sun & Moon health balls ship in assorted colors. Since each ball is individually crafted, slight variation from pair to pair may occur, though each pair has been matched so each ball will match with in it's pair. What are the benefits? According to the traditional Chinese theory of "jungluo", there are various acupuncture points in the palm of one's hand. When exercising with the balls, the acupuncture points are stimulated. This promotes greater health. stimulates blood circulation improves memory relaxes muscles and joints relieving joint stiffness and soreness relieving stress promoting sleep