Fil-Tec Magna-Glide Poly Classics Style L 135yd Prewound Bobbins 100 Count White
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No. 60 Filament Polyester . Fil-Tec Bobbincentral's patented magnetic core creates consistent delivery through the entire bobbin. No more interruptions for tension adjustments as your bobbin gets smaller. Magnetic core prevents backlash or over-spin and eliminates the need for backlash springs. Magna-Glide is the original high-yield magnetic-core bobbins.