BOBBIN 15J SINGER PLASTIC
- Class 15J bobbins are compatible with Singer Futura Embroidery Machines series 2600s, 3900s, 7400s, 8700s and Izek 1500
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They look almost identical, but class 15 bobbins have flat ends, while class 15J bobbins have slightly curved ends. Sometimes they appear to work interchangeably, but even if they fit into your sewing machine, there is a risk of them jamming your machine up and causing major damage.