The Difference Between Class 15 and 15J Bobbins and Why You Should

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About Sewing Machine Bobbins & Bobbin Cases - Sarah's Workbench

Set of 36 Class 15J threaded bobbins in plastic case Each bobbin contains 50 yards of 100% spun polyester thread Set of 36 threaded bobbins, 18 white

SINGER Class 15J Threaded Bobbins for Sewing Machines, with Storage Case (36-Count)

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About Sewing Machine Bobbins & Bobbin Cases - Sarah's Workbench

SINGER Class 15J Bobbins in Cases, 36 Count - Transparent