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 carbide is approximately two times stiffer than steel, with a Young's modulus of approximately 530â700 GPa (77,000 to 102,000 ksi), and is double the density of steelânearly midway between that of lead and gold. It is comparable with corundum (Î±-Al.