Descriptions:  

1.This bobbin case,sewing machine part's item number is BC-HA1,it is with NS tension spring;

2.For:SINGER 15K30.83.16cl.17-23-u123-u133;

3.This kind of Bobbin case is use for whole machine;

4.Style: All kinds of high quality bobbin case;

5.Good quality and resonable price.