Fil-Tech Magna-Glide Poly Classics Style M Jumbo 222yd Prewound Bobbins 100ct Black. No. 60 Filament Polyester . Fil-Tec Bobbin central'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. 100 bobbins in box. CHK-12556-M
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Item# : SPM8505171627
Model # : CHK-12556-M