Flat car shuttle core sleeve bobbin case Compact, lightweight bobbin case designed for ordinary flat car shuttle style sewing machines. Simple to install and easy to use, this core sleeve holds the bobbin securely with an integrated shrapnel clip for stable thread delivery during sewing. Key benefits Convenient size and light weight for easy storage and transport. Integrated shrapnel clip secures the bobbin, reducing slippage and keeping thread feeding consistent. Simple installation and removal makes bobbin changes quick, minimizing machine downtime. Compatible with ordinary flat car shuttle sewing machines for straightforward replacement or backup use. Features Function: bobbin case core sleeve for flat car shuttle machines. Compatibility: fit for ordinary flat car shuttle type sewing machines. Design: reasonable size and light weight for convenient handling and storage. Usability: easy to install and operate, suitable for routine sewing tasks. Use scenarios Home sewing and garment mending where a quick bobbin change is needed. Small tailoring or alteration shops using flat car shuttle machines that require spare bobbin cases on hand. Onsite or mobile sewing services where lightweight, easy to store accessories are preferred. Notes Due to lighting, monitor settings, and manual measurement, actual color and size may show slight differences from photos. Please allow minor variations.