Actually the aluminum ones are a tad heavier because they are a solid chunk that is milled out while the steel ones are two plates welded to a cylinder, but neither one should be any weaker than the other. The aluminum ones are for people that want the blingy look.
And I've really liked my kit and haven't had any trouble with them. The company also sent them pretty quick when I ordered. Just take your time installing them and you wont have any trouble.
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