Singer Pre-Threaded Bobbins, 12-Pack: * Includes 12 bobbins: * 8 white * 4 black * 150" on each bobbin * Spun polyester thread * Washable * Colorfast * Can be used on the following Singer models: * 288 * 247 * 360 * 774 * 935 * 1022 * 1280 * 2210 * 2517 * 3732 * 2950 * 3270 * 3343 * 4325 * 4610 * 4622/22a * 4830 * 5040 * 5050 * 5070 * 5160 * 5417 * 5430 * 5705 * 5825 * 5830 * 5910 * 6012 * 6038 * 6233 * 7021 * 8222 * 8734 * 9110 * 9210 * 9300 * 9400 * 9410 * 9608 * 9858 * 57815 * 57820 * 57825 * CG-500 * CG-550 * CG-590 * HD110 * Can be used on the following SR models: * 240 * 250 * 320 * 340 * 350 * 400 * 500 * 700 * 800 * 1800 * 2500 * 3100 * 3300 * 4500 * 5800 * 6100 * 6200 * 6500 * 6700 * 8000 * 9000 * 9800 * Other drop-in bobbin machines