What are these shiny metal-like components in the images below?
Is that kapton tape covering for ESD protection?
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Hard to tell from the photo, but to me they look like SMD metalized film capacitors.
Lots of different film plastics can be used, including:
Polyphenylene Sulfide (PPS)
Polyethylene Terephthalate (PET)
and Polyethylene Naphthalate (PEN).
They are generally stable and low-loss, and often used in timing or converters circuits.
As shown by the PPS photo above, the electrode plates are sometimes visible, and I think this matches what is shown in the questioner's photo.
Some versions have a Kapton (or similar) film on top to provide some physical protection to the very thin capacitor plates. Edit:
(When extra photos were added, it initially looked like the devices had 3 terminals, but careful inspection suggests the "middle" terminal is just silkscreen marking.)
(Images from respective linked datasheets.)
Could also be high reliability capacitors, which are constructed from two series connected stacks of plates, so that cracking and short circuiting which happens quite often, does not stop the capacitor from functioning. Often used in safety, automotive and other applications.