The ring is resistant and also waterproof, if it get wet. Anyway it’s better not to keep it in the water for a long time!
It is a unique piece.
If you don’t know how to choose your size, have a look a this page.
SIZE (internal diameter):
7 1/2 US
0,7 inches
17,7 mm
If you have any question or doubt about size write me!
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