This pack includes 10 top-quality metal bobbins designed for use with various sewing machines. These bobbins are compatible with multiple models, including those numbered 54, 117.720, and 177.959, as well as models 31, 41, 43, 75, 77, 151, and 153, among other rotary models. Made from durable metal, these bobbins ensure reliable performance and smooth operation during sewing projects. They are suitable for a range of sewing machine brands and models, providing a consistent supply of replacement bobbins. Each pack offers a convenient quantity for ongoing sewing needs, making it easier to keep your machine running efficiently. Whether you're working on quilting, garment construction, or other sewing tasks, these metal bobbins are a practical addition to your sewing supplies. They are designed to meet the demands of various sewing machine models, ensuring compatibility and dependable performance.