Porkie,
Actual magnesium wheels would be stupidly impractical on the road. They just wouldn't last...
but the wheels with the mag content , are generally called "mags" for a reason !!
ive got a couple of sets and tbh , even though there very very light and you can feel the diff on the steering when on the front , there a pain in the arse , cause as they get older and older they become porous and keep going down , then they go out of shape , so , they have to be cheap and tested before ya buy old mag wheels !!
used to have a set of black 8 x 17 ears wheels , werent mag tho !! good wheels !!