Repeated action creates a dynamic magnetic field. Ferrite magnets create raised surface points that intensify the magnetic field to produce a flux path that extends farther from the surface. Kenko Balance.
I have used them years ago when they were the only thing that helped me be able to walk on a heel with bone spurs after an injury. It worked. So again I need a pair as I have some neuropathy that has been getting worse post chemo. Wow What a difference. They REALLY REALLY HELP. NOT THE CHEAPEST BUT WORTH EVERY PENNY.