I am not sure why everyone is answering about BOBBINS when I asked about BOBBIN CASES. They are different. A bobbin is a spool that holds thread for the bottom stitch on a machine. The bobbin case is the metal casing in which the bobbin sits, which is then placed in the underside of the sewing machine. If you need this explanation, then you should not be answering this question.
It isn't helpful to just provide facts that you may know, if it doesn't answer the specific question that is asked. It is a big problem on Yahoo! Answers.
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