Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <A123X-at-aol-dot-com> If they really are polyproplyne then they shouldn't be lossy. Mark In a message dated 5/31/01 1:48:16 AM Eastern Daylight Time, tesla-at-pupman-dot-com writes: > > I Don'no - according to GE's web site, these caps are polypropylene (ms?) > metal-film and not mylar. How does one tell if they are lossy? > > --jeff