Item Type:Rings<br />Metals Type:Titanium<br />Surface Width:10mm<br />Shapepattern:Round<br />Style:Trendy<br /><br />Ring Size：<br />Size 6 = Size 16 (Diameter 16mm) = Perimeter 50.24 mm<br />Size 7 = Size 17 (Diameter 17mm) = Perimeter 53.38 mm<br />Size 8 = Size 18 (Diameter 18mm) = Perimeter 56.52 mm<br />Size 9 = Size 19 (Diameter 19mm) = Perimeter 59.66 mm<br />Size 10 = Size 20 (Diameter 20mm) = Perimeter 62.80 mm<br />Size 11 = Size 21 (Diameter 21mm) = Perimeter 65.94 mm<br />Size 12 = Size 22 (Diameter 22mm) = Perimeter 69.08 mm<br />Size 13 = Size 23 (Diameter 23mm) = Perimeter 72.22 mm<br />Size:about 6mm in width，U choice diameter size (please don't use your image to judge size，0.2-2mm allowable error)