Madman`s sub-frames?
They're chromemoly tubular construction, and tuck up very nicely and are almost totally out of sight. I didn't weigh them before welding them in, but they aren't very heavy at all.
Call Madman himself for more info. I'm sure he'd have no problem giving you details on them.
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George is right that they are Chromoly tubing and are spot welded all along. He tries to tuck the subs up as far as possible to not hurt your ground clearance.
I have them on my formula and had them on my Camaro and I must say that both cars are monsterously stiff.

