Serpico polished black tungsten rings have centered grooves. Serpico is a Black Dual Grooved Ring Center Matte Finish. Serpico has comfort fit and a design that will last forever.
The Metal that is used is a Nickel Binder that is higher in quality in comparison to cobalt. Cobalt is a inferior binding agent which may darken the color of the ring over time. Cobalt is most common in lower cost tungsten rings. This is due to the rings being mass produced in countries other than the United States.
Serpico black dual grooved tungsten rings can also be found in 8mm silver Serpico brushed womens tungsten rings.