Jade Chi Kung Hand Exercise Balls (Baoding Balls) With Ornamental Box Develops nimble fingers and hand coordination, through rhythmic flexing of wrist, fingers, hand and arm tendons. Ideal for people whose livelihood depends on hand dexterity. Made from Afghanistan jade. Excellent warm-up exercise before activities such as painting, piano playing, calligraphy etc.. Stimulates the meridians that flow into the fingers.