Whatand 39;s the ball used f - Baoding ball is traditional folk fitness equipment, designed to do h exercise, make your thoughts focused on the h,strengthen your hs keep them flexible.Premium Natural Material - This health ball is made of beautiful natural black obsidian gemstone, the traditional cutting process make it smooth shiny.Good f all - As a h exercise tool, this Baoding Ball is good f adults, children people who need surgery rehabilitation, enhance blood circulation blood flow by controlling with the pressure of your h.Different Sizes - 1.57 in is f small to average hs. 2 in is f larger hs me skilled users.A Great Gift - Baoding ball iginated in the city of Baoding during the Ming Dynasty in China, itand 39;s a good personal collection a beautiful gift.Baoding ball is traditional folk fitness equipment, it can enhance blood circulation blood flow by controlling with the pressure of your h, strengthen your hs keep them flexible, fine mot movement exercises the brain keeping it sharp. How to use Hold 2 balls in one h rotate them in circles in the palm of your h. Relying on five fingers flexion extension, so that the two balls circled with each other. Description: Material: Beautiful natural black obsidian gemstone Size: 1.57 diameter, 2 diameter Col: Shiny Black Package Included: 2 Pcs Baoding Ball