These are quality steel bobbins made in Taiwan  

No.  2996  Steel bobbin   

Fits Singer Sewing Machine Models:

16 Class, 16U, 31 Class, 32-45, 32-63, 32-64, 331K, 331K1, 331K2, 331K3, 331K4, 331K101, 331K102, 331K103, 31K19, 31K21, 31K47, 32K4, 32K6, 37-2, 37-3, 37-4, 37-5, 37-6, 37-7, 37-8, 37-9, 37-10, 44 Class, 44-91, 46K10, 46K14, 68, 69 Class, 78 Class, 431F200A, 51-1, 51-2, 51-3, 51-4, 51-6, 51-7, 51-8, 51-9, 51-10, 51-11, 51-15, 51-16, 58-1, 58-2, 58-3, 58-4, 58-5, 58-9, 58-10, 58-11, 58-12, 58-13, 58-15, 58-14, 58-16

Also fits Consew Sewing Machine Models: 118 Class, 18 Class, 28 Class and Adler mod. 37 (#0037-001620)