I am causing some pressure on the band in that pic, otherwise they are invisible. The way I noticed, I happened to run my hand across the top of the headband when they were on my head and felt where they were indented in those spots.
The plates you can replace are on the sides, the top part is built in.
My PS4 is by my PC, so if I'm basically not playing Destiny with someone, they sit on my desk. I don't think these are from any sort of shock, they seem to just be weak spots in the plastic that are cracking from wearing them. The cracks are definitely formed from that direction, from flexing the headband out.

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