22 Pcs 25.4mm M Style Bobbin Case Springs, No Backlash Bobbin Springs Compatible with Singer JUKI Sewing Machines M Bobbin Case, Black Sewing Machine Parts

["Packaging and Size: Get 22 pieces in one set. Suitable for 1\" Diameter \"M\" Style Bobbin Cases using Large Capacity Hook. Please refer to the size information in the images to confirm compatibility","Material: Made from high-quality metal, it features high hardness and wear resistance, ensuring long-term use","Use: It effectively reduces the clearance within the spool sleeve, providing tension control that prevents loose needles and thread nesting","Function: No back-pull brake spring applies constant, light pressure to the bobbin to prevent over-memorisation","Design: The ample quantity is sufficient to meet the repair needs of both households and sewing shops, while also providing a generous supply of spare parts"]