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It's an ingenious design that we cut out of a V-Notches on both end of the bobbin. Then cut out a crack between two V-Notches. The crack can seizing-up the end of a thread , to help you find it soon. You can also nip a stack of paper by this bobbin and nip a photo by two of this bobbin then it becomes a photo frame. As you see, our design reduces the waste of materials effectively.
Ningbo University of Technology