Metal Class 66 Bobbins 4/Pkg For Singer models 66, 99, 101, 185, 192, 201, 247, 288, 327, 328, 329, 401, 403, 404, 413, 416, 418, 457, 476, 477, 478, 500, 717, 719, 814, 834, series 6100, 6500, 7100 and other drop-in bobbin machines.