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"M" style prewound sideless bobbins have 132 yards of black, high tenacity, polyester thread.
Approximately .53 cents per bobbin
Patented magnetic core and advanced EB "cross-link" technology results in consistent tension from beginning to end, no backlash or over-spin, and reduced lint and residual buildup in your bobbin case.
Turn used cores into cash while doing your part to help make the world a little greener. See details in each box or click on link below to see how easy it is!
http://www.corereturnprogram.com/
Sold in boxes containing 100 prewound bobbins
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