This is a very fine, tightly twisted filament silk that is extremely useful when couching silk wrapped purls, gold threads, and attaching spangles. The neutral gold color blends in with any metal thread couching and its small size (yet strong) enables it to disappear when using it with silk wrapped purls. I find that I would rather use one thread for all these uses than continually change the thread in my needle. Each spool has 109 yards on it.
There is gold (either #86 or it's replacement #74) and silver (#28).