This cable wire designed magnetic therapy bracelet is made with 100% stainless steel for long time durability that will not tarnish. It has 2 - 3000 gauss neodymium rare earth bio north facing magnets in each door knob end. The magnets are on the surface and can rest directly against the skin unlike other styles that have the magnets on the inside of the knob. With the magnets on the surface as this bracelet is made, the surface gauss is considerably higher than when the magnets are on the inside.