My 2 cents: I don't use the Coats and Clark anymore. It gives my machine fits. Machine is approx 25 yrs old, a Singer and not the top of the line. I mostly use Gutterman or Mettler, all 100% cotton but I do have some silk glace 100% cotton that I just love. I think ConnectingThreads.com might carry it but not sure. I know I have seen it on the web somewhere. I got mine when stationed in Germany with the Army.