Different machines fit different bobbin classes, they're not necessarily interchangeable, even though they look the same! Please consult your sewing manual to determine type of bobbin needed for your machine.
Pack of 12
Fits some of the following machines: Singer, Baby Lock, Brother, Riccar, Simplicity & White.
Not compatible with the following machines: Bernini, Elna, Husqvarna / Viking, Janome / New Home & Pfaff.