aftermarket wheels vs. stock

[Pac-man]

Hello everyone. I'm looking at the Z06 motorsport wheels in the Z06 sizes and have a few questions. They are painted black, not powder coat, therefore durability is a concern. Any insight? Also, does any one know the weight difference between these and the stock Z06 wheels which are spun aluminum? I know the aftermarket wheels are inferior in weight and quality, but how bad are they really?

 

[yellow_2002_germany]

From what I have researched for the same wheels, they are about 3-4 lbs heavier than stock. I would assume that means each.