Two main parts of the intervertebral discs are the outer ring (annulus fibrosus) and the inner gelatinous material. (nucleus pulposus). The outer ring consists of fibrocartilage, while the inner material shows many similarities to the articular hyaline cartilage both in its biochemical and histological appearance.
For this reason, Everything Wedding Rings recommends avoiding black tungsten wedding bands-with one exception. Titanium Kay has recently launched a new tungsten carbide wedding ring design with solid black inlay that is 100% scratch proof. So, if you are looking for a tungsten ring with black inlay features I highly recommend one of the Titanium Kay 2nd Generation rings.
Tungsten (pronounced /tÊÅstÉn/), also known as  wolfram (/wlfrÉm/), is a chemical element with the  chemical symbol W and atomic number 74. Tungsten is one of the  heav â¦ iest materials after gold, for the density of tungsten is 19.25  gâ¢cm3(near r.t.).    Tungsten is one of the Nonferrous Metals, and also it is as  molybdenum and rare earths which are Refractory Metals.   It is also used in eletrical bulbs as filament.