The duo balls came sort of Surprising, I expected two separate ones, These Are attached to eachother much like a type of play-bone for dogs. Hoewver, performance is good for the back, shoulder blades and neck Especially between area, Kidney points are good to get, you can Rolla Along the whole bladder meridian and assure fine effect on all inner organs. Disadvantage: It is kind of softish, easy to become longer and flatter after a few days and do less effect on the deep points. For feet I would recomment single balls and Actually if you get two singles and put them into a sock and tie together itthe you willhave the same double effect if you wish, but can change any time to the more fexible application by using single balls indivicually , But all in all a good tool with many useful applications.
