Up for sale is 3 bobbin winder rings. This is the most used size (Medium). The inside diameter is about 5/8" and the out side is 1 1/8". Triple A Quality, Unlike other belts that will not last long or harden or crack . Guaranteed  to give you years of service.  Order as many sets as you which for the same S&H. Item will ship First Class with Delivery Confirmation .Please e-mail any questions. Thanks