Bobbin Thread for Domestic Machines:
Bobbin thread is a lightweight thread for machine embroidery or machine basting. When it is used for machine embroidery, it allows the back of the embroidery design to be much less dense than the front of the design. This is especially helpful when you are embroidering lightweight fabric. It prevents the already dense embroidery from being even more dense and rigid than the fabric and keeps it more pliable than it would be with regular thread in the bobbin.
White has approx 145 yards/bobbin.
Black has approx 135 yards/bobbin.