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Don't know about the 6th gen inserts, but on the 5th gen ZL1 inserts, they are ALL carbon fiber, both the exposed and the black ones.
The difference is the exposed carbon fiber inserts have a weave pattern that is perfect. It has to since you can see the weave.
The weave pattern in the black ones don't have to be perfect since the insert is painted, but it's still carbon fiber.
It takes a lot more effort during manufacturing to get the weave pattern perfect and uniform, thus the added cost to get the exposed carbon fiber insert.
Could you possibly take a black painted carbon fiber insert and remove the black paint leaving it exposed? Sure. But there's no guaranty what the pattern of the weave will look like.
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