Madeira Mag Core Bobbin L 308-507 White Key Features: • Magnetic Core: Sideless Magnetic Core Ensures Secure Placement in the Bobbin Case, Maintaining Consistent Tension. • Lint-Free: Continuous Polyester Filament Thread Reduces Lint Buildup, Keeping Your Bobbin Case Cleaner. • Economical and Durable: Designed to Be Both Cost-Effective and Long-Lasting for Frequent Use in Embroidery Shops. • Smooth Performance: Minimizes Over-Spin, Friction, and Wear on the Bobbin Case for Smooth, Consistent Stitching. • Professional Quality: Perfect for High-Performance Embroidery, Ideal for Machines with or Without Anti-Backlash Springs. Keywords: Madeira, Embroidery Bobbins, Magnetic Core, Polyester Thread, Pre-Wound Bobbins, Durable, Professional Quality, Smooth Stitching, Embroidery Accessories