Features 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