Comfort Fit Black Titanium 2-Tone Dome Band, Sizes 5 to 14 Polished Black Titanium Ring with Natural Titanium Grey Edges Half Dome Ring Measures 8 Millimeters or .31 Inches Wide Titanium is Corrosion and Scratch Resistant Stronger than Gold or Steel, Yet Lightweight Titanium is Hypoallergenic and Gentle on Sensitive Skin