Upgrade your sewing setup with these Dritz Class 66 Plastic Bobbins, designed specifically for drop-in bobbin machines. Made from durable, lightweight plastic, this bonus pack includes 10 high-quality bobbins that ensure smooth thread delivery and consistent stitch performance. Ideal for everyday sewing, quilting, and crafting projects, these Class 66 bobbins deliver reliable tension, compatibility, and convenience. A perfect replacement option for maintaining precision and preventing thread jams in your sewing machine. Key Features: Durable Plastic Design for smooth thread feeding Compatible with Class 66 drop-in bobbin machines Lightweight construction helps maintain balanced stitch tension Includes 10 bobbins per pack for long-term convenience Ideal for sewing, quilting, and crafting projects