For Quilting machines, not Upholstery machines, Fil-Tec Magna-Quilt Prewound Bobbins Egyptian Long Staple Mercerized Cotton No. 50 (Tex 24). Has the look of cotton but has the strenght 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. 10 M-style prewound bobbins per jar/135 yards of thread per bobbin. FILTEC

FILTEC Egyptian long-staple cotton thread on our original magnetic core bobbin. Used for sewing, quilting and embroidery. Size - M/Jumbo
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Judy B, Anniston AL
Customer service rep very helpful.