The trick is that when the magnet vibrates, it stimulates the same nerve endings that are picking up the vibration of your fingerprint ridges rubbing over somet

The trick is that when the magnet vibrates, it stimulates the same nerve endings that are picking up the vibration of your fingerprint ridges rubbing over something. After a little integration period, the sensation is similar to a very light touch running over the fingertip. I don't know if a ring would produce the same sensation.