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On the typical zipper, the gap of the tab holder (crown) is always placed on the side. The gap will lose its shape from pulling after many times of use; that makes the zipper lose the pull tab. It seems such a waste to throw good things away because of losing a little component. The design concept of C-Fastener changes the place of gap to the middle from the side on the crown. Its stronger by avoiding pressure on the gap when zipping. Therefore, it extends the life of things and reduces waste.