I use Superior Sew Sassy size 12 thread with needle size 100/16 topstitch and #2 tension setting. I use 60 wt in bobbin. This looks great when doing machine applique with the blanket stitch. Size 12 is equivalent of two strands of floss and it is on a spool. Also is better then floss when doing hand embroidery or crossstitch on quilts. Stronger and no bleeding.