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. These Class L bobbins are suitable for most domestic sewing machines.
Recommended Needle Size: 65/9, 4.0 Longarm
Made of: Polyester
Recommended Use: Bobbin thread
Thread Weight: 40wt, 2 ply
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