Prevent your lower thread from suddenly failing with Prym's Clear Plastic Bobbins for Horizontal Hook Sewing Machines. This pack includes four bobbins of the same size (Ø 21.6mm, H 10.4mm) for Husqvarna and Pfaff. The horizontal spool holder system works without a spool holder and with low thread tension, making it easier to use your sewing machine. In addition, the transparency of the plastic allows a clear view of the color and the remaining amount of thread on each bobbin. Prym offers these bobbins for various brands of sewing machines, including JANOME, BROTHER, SINGER, BERNINA, HUSQVARNA, and PFAFF.