Item Type: Bobbin Specification: 1 set Material: Iron, aluminum Application: Used for most walking foot industrial sewing machine Package List 1 x Bobbin Case 5 x Aluminum Bobbin 5 x Iron Bobbin 1 x Storage Box 1The kit includes 10 bobbins and a bobbin case, which are necessary replacement parts for the sewing machine. 2The aluminum bobbin is light in weight, the thread is glossy, and the sewing thread will not be damaged when used. 3The iron bobbin is rustproof and corrosionresistant, and the small hole design can help reduce weight, and it is not easy to break the sewing thread. 4The bottom of the bobbin case has a positioning hole, which has the advantage of improving positioning accuracy. 5These parts are small and light, put in a storage box for easy carrying, and can be used for most walking foot industrial sewing machine.