So these are kind of interesting. (most of you already know what these are)
The design is interesting.
The protruding silver ring with the 9 vents is where the driver sits.
There doesn't seem to be damping (because there's no space for any) so I guess these vents act as the tuning for the driver.
The rest of the cup is a slightly curved thick piece of plastic for the earpad to sit on.
So it's super minimalist.