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Of course. "ring_lotr" is obviously the tag "ring lord of the rings"; the rest of the file name is the inner diameter in mm, in the format "XXmmYY" is XX.YY milimeters. For example: ring_lotr_11mm95 has an inner diemeter of 11.95mm. If you want to follow another standard/ system you could use this chart http://www.ringsizes.co/ , from where I've based the sizes of the ring.