Multifunction metal bobbin case with reusable metal bobbins designed for sewing machines and embroidery equipment Key benefits Consistent bobbin winding: Builtin security notches keep the thread in place while winding, producing even, reliable bobbins that reduce tangles and interruptions. Reusable and durable: Metal bobbins withstand repeated use and can be refilled, reducing the need for singleuse spools. Compact protective case: A small bobbin case stores and protects bobbins, keeps replaceable empty spools organized, and makes transport simple. Smooth sewing performance: The bobbin case and metal bobbins work together to help the machine run more smoothly and maintain steady thread delivery. Precise workmanship: Delicate construction improves handling and operation and helps maintain consistent results across projects, helping improve conversion rates. Function and compatibility Designed for everyday users of sewing machines and embroidery equipment. Functions include secure bobbin winding, safe storage of empty and wound spools, and use as a replaceable bobbin case for small bobbins. Materials: metal bobbins with a small, lightweight bobbin case for easy handling. Practical applications Home sewing and repairs: Wind multiple bobbins ahead of time for garment alterations and mending. Embroidery projects: Prepare colorspecific bobbins to speed thread changes and keep projects organized. Small production or craft sewing: Keep spare bobbins ready to minimize downtime during batch work. What you get Metal bobbins plus a small bobbin case suitable for daily use with sewing machines and embroidery equipment. Simple to install, refill, and store.