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The Singer Class 66 Threaded Bobbins - Black & White will make a great addition to your sewing supplies. This set of 12 Class 66 threaded bobbins can be used in Singer and other top drop-in bobbin machines. Six black-threaded bobbins and six white-threaded bobbins with 50 yards of thread in each come in a reusable plastic case. All the threads are 100% spun polyester. Ensure you do not add a thread to a partially wound bobbin, as it may be uneven and cause the thread to tangle or break. Refer to your machine manual to ensure the correct bobbin size.