New high quality L Type steel bobbins, part #55623S. Lot of 8 bobbins. Compatible with the Singer 115, 188, 206, 206K, 306, 306W, 306K, 319, 319K, 320 and 320K. Many new L type bobbins have fitment issues when winding bobbins on the 'swing needle' models, but I have had consistently good fitment with these ones.
See below for list of other compatible Singer sewing machines:
103K7, 120U, 188K1, 191D200A, 20U, 20U11, 20U13, 20U31, 20U33, 20U43, 20U53, 20U73, 20U73B, 20U83, 20U83B, 206K, 251, 281, 291U1, 291U3, 1191D300A, 1591D300A, 591D200A, 591D300A, S16