Machine Embroidery Bobbin fill Thread
Bobbin fill has many names: bobbinfill, Bobbin fill. bobbin Thread. All of these relate to the thread that you use on your bobbin for in the hoop machine embroidery.
It is available in white or black as standard - and used dependant on the colour of the material you are embroidering onto. such as: black bobbinfill for dark materials
Bobbin fill brands from: Brother and Marathon