Finger fitness ball Precious natural wood,The longer the use, the more beautiful the surface of the ball: Indiai Rosewood(Dalbergia cochinchinensis Pierre) Long-term use, very beneficial to human health. Particularly suitable for the elderly and patients. It will also have a healing effect on the patient after surgery. Efficacy 1 : Empowerment of hand, flexibility and agility Efficacy 2 : regulate the central nervous Efficacy 3 : There Huoxuetongluo effect Efficacy 4 : Brain Exercise