Our Wavy Groove is a single titanium ring with a sinusoidal groove machined
in. The ring shown is 6mm wide. It can be specified in different finishes, where
the groove stays polished.

sinusoidal - si-nu-soi-dal: of, relating to, shaped like or varying according to
a sine curve or sine wave. The sinusoidal groove in the Wavy Groove
Titanium Ring from Titanium Ring Co. is awesome...