Dritz Plastic Class 15 Bobbins 4 Count 929. Class 15 Bobbins. Four removable and top drop-in bobbin cases. Fits some of the following machines: Singer, Baby Lock, Riccar, Simplicity and White. Consult your sewing machine manual to determine type of bobbin needed. CHK-929
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Item# : SPM15934642928
Model # : CHK-929