Singer Bobbins, 66K type Plastic drop-in bobbins. Pack of 5.

 To fit Models: Singer 200, 300, 400, 500, 600, 5800, 6100, 6200, 7100, 8200, 8600, 9000, 9600 ranges also 5417, 5430, 5802, 5805, 5810, 6038, 2818, and other drop in bobbin machines