This is a Janome recommended under embroidery thread. Janome as well as Baby Lock and Brother recommend #90 bobbin thread. I have never had a spool problem in the year since I bought the machine and I have never had to change the spool tension from the "automatic" setting. Also, this product sheds almost no lint, which is a problem with many prewound coils. Also, many embroidery tension problems are caused by incorrect bobbin thread weight.
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