Abstract: A permanent magnet assembly for use in a therapeutic product comprising four disk magnets held in an edge-to-edge array with a steel washer as an armature under the four magnets. The holder for the magnetic parts comprises two integrally joined sheets of flexible plastic such as PVC, one sheet constituting a body having indentations forming cavities sized and shaped for the magnetic parts, and the other sheet constituting a cover folded over and sealed to the body sheet around the indentations to hold the magnetic parts in place. Four alternative embodiments comprise single-magnet arrays with flat magnets of different shapes held in holders similar to the holder of the first embodiment but with cavities that are the same shapes as the single-magnet arrays.