10 BOBBINS INCLUDED: Ideal for pre winding your embroidery bobbin thread to have ready when needed, and for keeping extra bobbins on hand for winding sewing thread colors to suit your projects HIGH QUALITY, DURABLE CONSTRUCTION: Premium quality plastic bobbins can be reused many times, with security notch for consistent bobbin thread winding CLEAR VIEW BOBBINS: The clear, transparent plastic allows you to easily see when your bobbin thread is running low GENUINE BROTHER ACCESSORY: Specially designed and manufactured for optimal results with Brother sewing and embroidery machines CLASS 15 SIZE: 7/16 inches deep bobbins fit home sewing and embroidery machines that use Class 15 bobbins; See your product manual for bobbin size specifications