Silencers - "The process of Inverse String Winding compresses the outermost part of the cover wrap leaving the internal structure of the string intact. Exclusive to S.I.T., this design produces a silky feel which is easier on your fingers and frets, but explodes with a great sound. Perfect for fret-less basses. Nickel plated steel over hex-core."They also make semi-flats, whatever those are.
Interesting to know how that differs from GHS Pressurewounds. Sounds different, but seems like the same idea. GHSs are Alloy52, however.