Jekyll 7mm wave specialty uique rings made from tungsten carbide. Jekyll rings comes with comfort fit. Jekyll found in 8mm width here: Jekyll men’s wave unique rings
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.