According to what I found when I googled it, it is a 60wt thread. This would make it similar to Superior Thread's "Bottom Line" which I just happen to be using on my bobbin with a cotton variegated top Sulky 30wt and it is working very nicely on my first QFK. I believe that embroidery thread for my machine is 60wt. So I suppose you could use it to sew with, but you would probably have to adjust the upper tension. I did have to adjust mine to accommodate the heavier upper thread with my current combo I mentioned above. Am probably doing it all wrong in my rather intermediate newbie fog, but heh, it's working... ;-)