The control arm made of hardened steel and compound with RC ball joint which allowed Roll Center adjustment, it will correct the suspension geometry of a lowered car, putting the control arms back closer to its original position, resulting in increased steering response and stability while eliminating bump steer. A good control arm can regulate the movement of wheels quickly each time you turn or corner. . ED process and painting for the highest durability . Equipped with premium quality bushings . Superior strength and durability . Dramatically improving handling performance