Class 15 Bobbins. Four removable and top drop-in bobbin cases.
Plastic Bobbins - Class 15 (4 ct)
Dritz Safety Pins 100 Assorted 1460 – Brooklyn General Store
Dritz 12-Piece Class 15 Bobbins, Plastic
Dritz 929 Plastic Class 15 Bobbins-4/Pkg
Bobbins & Bobbin Organizer
Singer Class 15 Bobbins - 4/Pack - Clear - WAWAK Sewing Supplies
Dritz Class 15 Bobbins 929- 4 count – Good's Store Online
Dritz 928 Metal Class 66 Bobbins-4/pkg - UK
Bobbins, Class 15, Singer, Dritz and No Brand Name