Superior 'Superbobs' Pre-wound bobbins Size 'M' (Large)
Prewound bobbins are used extensively in Industry and by longarm quilters who require as much thread on a bobbin as possible to reduce downtime. Superior prewound bobbins are available in a range of colors and are filled with Superior's super fine Bottomline Polyester thread.
Size M bobbins are the largest of the bobbin sizes and will not fit home sewing machines. The bobbins are roughly the size of a 10p piece (24.9mm diametre x 10.7mm deep) M style bobbins fit about twice as much thead as a 'L' style bobbin and are designed for Longarm quilting machines and industrial embroidery machines.
Bobbin size 215yds