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 -- http://www.simegen.com/sgfandom/rimonslibrary/oht.html) 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 retainers. Digen does get them manufactured and on the market in Sime Territory within a month.