quality materials: The bobbin case is made of plastic that is durable and corrosionresistant. Exquisite workmanship and a bright surface with no scratches ensure a reliable accessory for longterm use. performance: In the bobbin area of sewing machines, the bobbin stops rotating promptly when the machine stops, helping prevent the bobbin thread from loosening or tangling during start and stop cycles. Efficient: The automatic speed thread trimming feature of the bobbin case enables quick, efficient trimming and makes it convenient to old or broken bobbin cases. Easy to use: Easy to install, use, and store. A practical accessory for sewing machines that can improve work efficiency and streamline your sewing workflow. Use scenarios Home sewing projects: Ideal for garment making, alterations, and repairs, helping maintain smooth bobbin operation and reducing thread tangling during starts and stops. Small workshop maintenance: Useful for replacing worn or broken bobbin cases to keep machines running with minimal downtime and downtimerelated issues. Projects with frequent starts and stops: Beneficial for quilting, patchwork, and multicolor sewing where reliable bobbin performance and quick thread trimming save time and effort.