No, plastic as in plastic. The pinch bolts however are made of cheese.
Actually Chas is right, I believe higher series Shimano chainsets have preload caps made of alloy, not plastic.
That said in a battle of cross threading the axle thread will always win vs. alloy or plastic pre-load.
And you don't need it anyway if in a bind and you've lost it.
Huh, I’ve inadvertently revealed my lack of experience with higher series Shimano.
@pifko started
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No, plastic as in plastic. The pinch bolts however are made of cheese.