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.

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.