I wore a copper/magnetic Sabona bracelet for over four years. Using a computer up to twelve hours a day, the Sabona was the only thing that kept my wrist from hurting. Pro golfers and rodeo folks seem to like them for the same reason. It was a real savior.
I finally ditched the bracelet. Why? I kept scratching my watchbands with it when sleeping. A couple of months using a wrist strengthening gyro, the pain is gone along with the bracelet.