Fil-Tec Magna-Quilt Prewound Bobbins Egyptian Long Staple Mercerized Cotton No. 50/2 (Tex 24).
Has the look of cotton but has the strength and colorfastness of polyester.
The magnetic core rotates the bobbin consistently throughout the entire bobbin which results in uniform tension to the last stitch.
Consistent tension throughout the bobbin increases stitches per bobbin.
This equates to more time quilting and fewer bobbin changes.
No backlash or overspin issues
20 L-style prewound bobbins per jar/74 yards
the L Style bobbins are the same diameter as the Class 15 bobbins. As such, you can use L Style bobbins in a sewing machine that uses Class 15 bobbins