Below, you can find the full FFXIV: Shadowbringers item info for the Oddly Specific Mythril Rings item. This item is a Metal and is usually a crafting material or the product of a craft. Sometimes it can be dropped from a monster or found in a chest.
Metal Ore Stone Gemstone Parts
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Oddly Specific Mythril Rings |
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Metal Level: 1 |
Item Level: 460
NPC:  35 |
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The requirement that each ring be the same size does not seem to be especially odd or specific at first, but such opinions soon change upon realizing they must be crafted while blindfolded. |
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