【Common for Brother, Janome, JUKI, TOYOTA, Singer】 Material: Plastic, 50 pieces 11.5mm bobbins for home sewing machines Bobbin size: Approximately 20mm x 20mm x 11.5mm High-quality transparent plastic bobbins, allowing you to see when the thread is running low and rewind them. These bobbins can be used with all brands of home sewing machines that use 11.5mm high bobbins and a horizontal rotary hook. They cannot be used with older Brother sewing machines that use 9.2mm high bobbins, nor with industrial sewing machines. Please be sure to check the bobbin size of your sewing machine before use.