● Set of 4 Bobbins● Made of transparent durable plastic for strength and visibility.● Thread the bobbin easily when winding thanks to the hole on the side of the bobbin.● Fits most SINGER mechanical sewing machines and select SINGERcomputerized sewing machines. Please refer to your sewing machine manual to ensure the correct bobbin size.● Fits sewing machines in the following SINGER sewing series: MA, MB, CC, CD,and EB.