Can I use the Sulky 12 wt. Cotton in the bobbin?

Some machines love it for bobbin work, but if yours doesn't, use the matching Sulky 30 wt. Cotton in the bobbin. Sulky 30 wt. Cotton comes in the same beautiful 66 colors. When using heavier threads like the Sulky 12 wt. Cotton, many sewing machine manufacturers suggest using a separate bobbin case made just for this type of work, or a separate bobbin case that is loosened to better accommodate heavy threads. (We do not recommend adjusting your bobbin tension ever! Be sure to use a separate bobbin case if you are going to change the tension for heavy, decorative threads.)