Typically the 180-degree bend breaks the paper clip in less than half the number of bends due to the greater stress on the bending point. If serrated paper clips are available, the serrations give a point for cracks to start, so the clips will typically break sooner.
DoestheshapeofaPaperclipchange:
Paper clips usually have an oblong shape with straight sides, but may also be triangular or circular, or have more elaborate shapes. The most common material is steel or some other metal, but molded plastic is also used.
