Material: Stainless Steel
<br /> SIZE : 
<br />7: Width: 8MM, Diameter: about 18mm
<br />8 : Width: 8MM, Diameter: about 19mm
<br />9 : Width: 8MM, Diameter: about 20mm
<br />10:Width: 8MM, Diameter: about 21mm
<br />11:Width: 8MM, Diameter: about 22mm
<br />12: Width: 8MM, Diameter: about 23mm
<br />Color : Black , Gold  , Silver
<br />Notice : 
<br />1:As different computers display colors differently, the color of the actual item may vary slightly from the above images.
<br />2:Attention: please allow 1-2 cm(0.4-0.7in) error of measurement.
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<br /> Friend,have a good day!