Aftermarket compatible with Singer 221 singer 301 Bobbin

Guaranteed to fit Alphasew Sewing Machine Models: 221 FeatherweightGuaranteed to fit Bernina Sewing Machine Models: 217, 540Guaranteed to fit New Home Sewing Machine Models: NLBGuaranteed to fit Singer Sewing Machine Models: 221 Featherweight, 221-1, 222, 301