Zenith Metal Bobbins and Bobbin Case Outer are designed for sewers who demand durability and precision. Made from high-quality steel, these bobbins and bobbin case are compatible with all domestic SV sewing machines with half shuttle mechanisms. Key Features: Durable Steel Construction: Built to last, ensuring long-lasting performance. Compatible with SV Machines: Perfect for domestic SV sewing machines with half shuttle mechanisms. Smooth Operation: Ensures consistent stitching and reduces thread breaks. Rust-Resistant Finish: Protects against wear and tear, ensuring longevity. Easy to Use: Simple to load and replace, making sewing hassle-free. Whether you're a professional tailor or a home sewer, Zenith Metal Bobbins and Bobbin Case Outer provide the reliability and performance you need for all your sewing projects.