We're speaking of the fender here, so the wheel arch, not the bumper. Of course a modern bumper is always made of plastic. But the fenders usually are made of steel or alumminium, only in certain models is it plastic.

And here it's plastic, and in fact it's the same piece that is bumper and fender, a huge piece of plastic so that there is no shutline in the front area.
But it may cost more because you replace the whole in case of a problem...