1,000M Cop Underthread - 60/2 Marathon embroidery underthread (also known as bobbin thread) - 180s polyester 1,000m cop - 100% spun polyester yarn
10,000M Cone Underthread - 60/2 WHITE Marathon embroidery underthread (also known as bobbin thread) - 180s polyester 10,000m cone - 100% spun polyester yarn
Sideless with core - 100% spun polyester bobbin with no sides, but with a nylon core. Each bobbin is 130 metres and there are 144 bobbins in a box.