For the micro ring,we have 3 size there:
4.5 x 3.0 x 3.0 mm,4.5 is diameter of outside,and 3.0 is inner diameter,3.0 is length;
4.0 x 2.7 x 2.7 mm,4.0 is diameter of outside,and 2.7 is inner diameter,2.7 is length;
3.5 x 2.0 x 2.5 mm ,3.5 is diameter of outside,and 2.0 is inner diameter,2.5 is length;
popular size is 4.0mm
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