Plastic Class 15 Bobbins 4/Pkg SINGER-Plastic Class 15 Bobbins. For Singer sewing machines: White (rotary), New Home (Rotary/old style), Necchi, Pfaff, Elna, Wizard, Brother, Morse, Atlas, Kenmore (rotary ), Universal Sewmore and Domestic (rotary). This package contains four measuring 7/16in from top to bottom. Imported.