autotronprime@ParaChomp Some Warbotron customers had this peice missing with thier figures. It attaches to the top of the foot. If you need one because it was missing then this will work exactly like the factory part.
The material is strong and flexible. Unlike the originals that do not flex at all and typically crack instead. If you order a set do not lube then like the originals. These have a better radius for easier movement so that the do not crack. Good luck, I hope this helps!