So fine top and bottom works beautiful, no back lash also so fine in top and bottom line for bobbin great tension.
--Recently was given cone of glide thread by fil tec with matching pre wound bobbin This is beautiful thread bobbin has magnetic core so far no problems again beautiful stitches.
I was also given their cotton thread with matching pre filled bobbin by fil- tec called Magna Quilt which is my preference however very hard to find.