Function:  According to the Chinese traditional medical theory of
"Jingluo" (jingluo refers to the main and collateral channels,
regarded as a network of passages, through which vital energy
circulates and along which the acupuncture points are distributed),
the ten fingers are connected with the heart, that is to say, by means
of jingluo the ten fingers are connected with the cranial nerve and
vital organs of the human body, including heart, liver, spleen, lungs,
kidneys, gallbladder, stomach and intenstine, etc.  On plucking the
iron balls with fingers, the balls can stimulate the various
acupuncture points on the hand, resulting in the uninpededness of
circulation of vital energy and blood in the body.  It can cause the
jingluo (channels) unblocked and thorough, the vital energy and blood
to function in harmony, the muscles nimble, the bones strong, the mind
sober, can invigorate the circulation of blood, and can prevent and
cure hypertension and various chronic diseases.  If you keep on taking
exercise everyday for months and years, you can get the fine results
of keeping your brain in good health with high intelligence and good
memory, relieving your fatigue, drowning your worries, and, moreover,
prolonging your life.