Large Quantity and Durability: 36 metal bobbins + transparent storage box, meet the needs of high-frequency sewing, the transparent box is classified and anti-lost, easy to keep the workbench tidy and worry-free for long-term use. Metal Resistant: High-strength metal material, anti-rust and anti-aging, anti-pressure and anti-abrasion, suitable for high-speed sewing machines, high-intensity garment workshops can also be durable and stable, eliminating the cost of frequent replacement. Quick Assembly Saves Time: Three steps to complete the winding: insert the frame → threading spring → pull the thread, universal snap compatible with many models, novice seconds to get started, double the efficiency of switching between multiple threads and colors, say goodbye to tedious needle threading. Portable Storage: Transparent box with 36 slots Independent, dustproof and anti-collision, the bobbins are fixed and not scattered, numbered and sorted for accurate access, the cover is sealed and portable, clean and tidy at home and outdoors. Wide range of uses: The metal bobbin set is compatible with Brother, Shengjia and other common household/industrial models, a multi-purpose box for multiple machines; the box is lightweight and contains a bobbin winding guide, novices can quickly get started, seamlessly adapt to the needs of home workshops, teaching and other multiple scenarios.