These arms allow for full adjustment of the suspension geometry without having to remove any parts! They allow for on car adjustment of camber, and also the length is adjustable and the pick-up points can be raised for better geometry. Constructed of high grade T6061 aluminum. They only weight 20 pounds per A-Arm, 40 pounds total. Also more rigid than steel Very light weight compared to steel They can be anodized different colors per customer’s request. These control arms are extremely strong compared to factory parts, and they look BEAUTIFUL! Work great for extreme driving conditions. Can be adjusted to make your car 1/2 inch shorter or wider on each side. Please allow 2-3 weeks for delivery.