The use of a pair of stone balls for exercise dates back to the early Ming Dynasty, some 600 years ago. In the past, throughout China, the balls were used by young and old, rich and poor alike as a form of passing time. It was found that playing with the balls not only relaxes any tension present, but also provides therapeutic value for both the body and the mind. The marble balls are used to limber fingers and loosen wrist joints. The motion of the fingers contracts and relaxes the forearm muscles, gradually building up strength in hands and arms. For musicians, athletes, and people who want to improve their dexterity, flexibility, and strength, this physical exercise routine is not demanding, yet it will produce beneficial results. According to old Chinese medical theories of "Jiang-Lo", which means a network of nerve paths throughout the body, the ten fingers connect directly to the heart. The heart has always been considered by the Chinese as the central station for vital energy as it supplies blood to the entire body. Simply by manipulating the two balls to revolve around each other with the fingers, the balls, in rotation, can stimulate the various acupuncture points on the hand that are links to the cranial nerves and vital organs of the human body. This results in clearing of the nerve paths from the heart to the vital organs, improving circulation of the blood and generally relaxing the muscles of the body. These Acu-Balls are unlike the metal balls currently sold, as the polished marble in the palm gives one a very natural feeling, resulting in an added state of comfort and tranquility. Acu-Balls by Launch Innovative Products is made entirely out of natural marble. Launch Innovative Products is a brand by Best Chess Set, a California based company, and this product is assembled in China in our own quality controlled factory.