100% Carbon Fiber Rims, that rim that is pictured weighs only 6.5lbs.
Which is absolutely, stupidly light.
For reference, the lightest saturn stock rim weighs 14lbs (sawtooths), while the average 15" steelie weighs about 20lbs.
http://www.zerotohundred.com/2008/auto- ... -at-275kg/
They cost 22 THOUSAND Canadian dollars.
Can't ball much harder than that.