We designed these arms to go through the roughest conditions. Origionally built for one of the toughest races on the planet, King of the Hammers , we built our arms only out of the best material. The main tubes are 1.25" .120" 4130 chromoly and the bracing is 1.25" .095" 4130 chromoly that are fully tig welded in house. The oversized balljoint holders are also 4130 chromoly for the strongest combo. Our design allows us to eliminate the clearance bend on the rear of the a arm, the point where it commonly fails, and still gain clearance over the factory arched a arm.