Ordering and delivery of the Galaxy Ring may depend on the customer knowing their finger size. If not, you’ll need to choose your ring size when ordering: Samsung offers nine different ring sizes. These steps can be skipped if the user knows the size of their fingers.
Moreover, it is not clear whether we are talking only about little fingers or all fingers: there was such information – allegedly Galaxy Ring can be worn only on little fingers.
As Android Authority notes, citing Blass, all ring sizes are based on standard US metric.
Source: Ferra

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