UMI Performance lower control arms are expertly crafted using strong DOM steel tubing for enhanced strength, rigidity, and bushing improvement. These direct bolt-on replacements effectively reduce wheel hop and enhance cornering performance. Featuring CNC Machined 0.120” wall thickness mild steel tubing, TIG and MIG welded construction, and grease-able polyurethane bushings with grease fittings, these arms are the top choice in the market!