Surface bars have been around for a long time now. The bar is made of titanium and is inserted just under the skin, it then travels along under the skin for a short distance then resurfaces. The bar is totally hidden under the skin and only the balls are seen. The balls can be changed to a variety of assorted beads and ornaments. These bars do migrate after some time depending on your skin area that it is inserted. Some areas with lots of movement tend to reject them sooner. But I have a few clients that have had them in for years and they look the same as the day they were put in.