Also known as: 乳环
A Ring Piercing placed in the Nipples or a ring-shaped Nipple Piercing. Use this if the piercing forms a closed loop of rigid material between both points of insertion into the skin.
If it is not a complete loop, or the loop is completed by non-rigid material such as chain, it should likely be tagged as Nipple Bar (and possibly Nipple Jewelry) instead.
Sometimes depicted with something attached to it, such as Nipple Jewelry, a Nipple Chain, Nipple Weights, or Used Condom.
Do not use when the rings are around the nipple and not embedded in it as a Piercing would be. Use Nipple Sleeves in this case.