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Pre-Wound Bobbins by Fil-Tec
*All of our pre-wound bobbins have a magnetic core. This helps eliminate may bobbin case tension issues and backlash problems. We stock them in both L and M sizes for long arm quilting machines. Some quilters find that removing the back lash spring from the bobbins helps the magnetic bobbins run better.
*Many domestic machines can also use the L size pre-wound bobbins.
*Our 60 wt pre-wound white and black bobbins are perfect for your Embroidery Machines!