The rubber pieces are hidden by the armor (gray areas in pics below), so it really shouldn't be an issue. I don't think they're even painted.
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So the socket hole and the grey petals are rubber? If its rubber its going to deteriorate. First you will starting having a figure that can't hold up its arms, then eventually have no arms at all once they fall out of the socket. They did this all for a pod mode that nobody is going to use? Very disappointed. Use the weakest materials for the area with the most heat and friction, what the hell kind of design is that? If someone has more information that will be very welcome.