US size 7-13.<br />Material: titanium steel<br />Ring size information:<br />6=diameter(mm）16.5=perimeter（mm）52.  <br />7=diameter(mm）17.4=perimeter（mm）55.<br />8=diameter(mm）18.2=perimeter（mm）57. <br />9=diameter(mm）19=perimeter（mm）59.8.<br />10=diameter(mm）19.9=perimeter（mm）62.4. <br />11=diameter(mm）20.7=perimeter（mm）65.<br />12=diameter(mm）21.5=perimeter（mm）67.5. <br />13=diameter(mm）22.3=perimeter（mm）70.<br />Package:1*Ring with bubble envelope