Rings worn on a finger of each hand that block or attenuate the ambient  around the Sime wearing them. Attenuators replaced the metalic retainers. (Source: renSime)

(Source:  Index card file, Jean Lorrah, comment from February 22, 1977)  Yone lost his in the crash.  His are much more sophisticated (great-grandson of attenuators -- See Klarion).

(Source:  Index card file, Operation High Time --  Invented by Mairis Farris.  Finger ring, worn on the third finger of each hand, which reduces a sime's perception of selyn fields.  Mechanism reduces affects of field gradients with no cumulative discomfort with a damper.  Meant to replace retainersDigen does get them manufactured and on the market in Sime Territory within a month.

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