This pack includes 10 metal bobbins designed for industrial sewing machines. Each bobbin measures approximately 21.5mm in width and 9.5mm in thickness. The bobbins are made of durable metal and may vary in color. They are compatible with a range of machines, including models 223, 224, 225, 226, 227, and 332. These bobbins are essential for smooth sewing operations and are suitable for various sewing projects. The set provides a convenient supply of replacement bobbins, ensuring you have enough for ongoing work. Each bobbin is crafted to meet precise specifications, making them reliable for consistent performance. Whether you're working on heavy-duty or detailed sewing tasks, these metal bobbins are a practical addition to your sewing supplies. They are easy to install and designed to fit securely in compatible machines, helping to maintain efficient sewing workflows.