Billet Lower Control Arms Blackworks Racing lower control arms are manufactured from solid 6061-T6 (solutionized and artificially aged), pre-tempered aircraft grade aluminum, utilizing CNC mills and CAD software in the engineering process. All design and manufacturing takes place in house, allowing for tighter tolerances, greater process control, and elimination of defects. Each control arm is laser engraved with a unique serial number ensuring that each piece is a genuine Blackworks Racing component. Lifetime Warranty on all Lower Control Arms Features: Fine tuning Non-sealed polyurethane bushing allow for more precise movement without the reliability issues and deterioration found in competitor's sealed bushings Hard anodized finish eliminates tarnishing and provides a high luster, protective coating that is available in a variety of colors. Control arms are engineered and tested for precise fitment Lifetime Warranty on all Lower Control Arms.