AIRES Flat Brush Finish Center Tungsten Carbide Ring - 4mm - 10mm This classic flat-profiled Tungsten Carbide design gets a handsome makeover by Thorsten with its wide brush finish in the center of the ring while its polished edges catch the light and create a noteworthy contrast. Engraving available! See Pictures for Details. Does Not Delay Order. Includes Thorsten Lifetime and Lifetime Sizing Warranty (excluding re-engraving). Available in 4mm, 6mm, 8mm, and 10mm widths for couples who want a matching set. Tungsten Carbide—the newest and strongest metal for jewelry that does not scratch easily. Comfort Fit – domed interior band slides over the knuckle easier with less friction.