Men's Guitare Opening Titanium Steel Ring

size:7#---12# Material: titanium steel

US Size: 4#,5#, 6#,7#, 8#,9#,10#,11#,12#,13#,14# (There may be a few millimeters of manual measurement error) 4--Perimeter: 46.9mm, Diameter: 14.9mm 5--Perimeter: 49.4mm, Diameter: 15.7mm 6--Perimeter: 52mm, Diameter: 16.5mm 7--Perimeter: 54.5mm, Diameter: 17.3mm 8--Perimeter: 57.2mm, Diameter: 18.2mm 9--Perimeter: 59.8mm, Diameter: 19mm 10--Perimeter: 62.2mm, Diameter: 19.8mm 11--Perimeter: 64.8mm, Diameter: 20.6mm 12--Perimeter: 67.5mm, Diameter: 21.4mm 13--Perimeter: 70.1mm, Diameter: 22.2mm 14--Perimeter: 72.7mm, Diameter: 23mm