Upgrade your sewing setup with these Class 66 Metal Bobbins, designed specifically for machines that use drop-in bobbin systems. Made from durable, high-quality metal, they ensure smooth thread release, stable tension, and reliable stitching performance. Each pack includes 4 premium metal bobbins from Dritz, making them an excellent choice for everyday sewing, quilting, and repairs. Key Features: Durable metal bobbins built for long-lasting performance Designed for Class 66 sewing machines with drop-in bobbin systems Smooth thread delivery for consistent, even stitching Trusted Dritz quality for reliable results in all sewing projects Convenient 4-pack for machine readiness and backups