|If you are a new coverstitch machine owner, you are probably caught of in the excitement of using binders (due in large part to Debbie Cook and Sew4Fun's great websites about using them). There are 2 types - A and B. A has a double fold on top of the fabric and no fold on the bottom. B has a double fold on top and a double fold on the bottom. In other words, the B binder produces sort of a B look (rounded top and rounded bottom).
Hope this helps you remember which is which.