Yes, the OE wheels have an impregnated steel bar through out the circumference of the wheel and cross bridge. I studied some throughout.
Some weigh a little more than most, but still heavy.

Those aluminum aftermarket wheels are super light but most if not all look silly and over exaggerated.
The closest that come to a stock wheel look as far as the outer ring are aluminum types made for boats, so of course I made a trip to the annual boat show at Javits and found most to be too big in diameter, thus putting on some pounds.