Feature: 1. The stainless steel bobbin is practical, rust-proof, strong, not easy to break or deform, durable, and can be used for a long time 2. These lightweight spools can stop spinning quickly and effectively to prevent the thread from tangling when sewing stops and starts 3. Comes with a transparent plastic storage bag, which is very convenient to organize, easy to carry, dust-proof and damage-proof 4. There is no need to worry about insufficient spools, with high-quality high-quality sewing machine spools, which will not break 5. The lock cylinder is suitable for most industrial sewing machines, used in industry, to update and replace old accessories Specification: Item Type: With Holes Iron Bobbin Core Product Specifications: 1pcs Product Material: Iron Product Use: Industry, Update and Replace Old Accessories Scope of Application: Suitable for Most Industrial Sewing Machines Package List: 1 x Lock Cylinder