Blackworks Racing Lower control arms made right here in the USA. These control arms are designed in house by a licensed, certified aero space machinist. They are drawn up and transferred our CNC Mills and from there the transformation begins. They are CNC machined from a solid hunk of 6061-T6 Pre-tempered aircraft grade aluminum. It goes through 2 stages of quality control until its off to anodizing making its way back for the laser process. Each one of our lower control arms features a serial number that is unique to each one. This allows us to make sure the product you buy is a genuine Blackworks Racing product. Our lower control arms feature a LIFETIME WARRANY on all bushings and sleeves! If you have any questions please feel free to call or email.