P2M S13 RLCA is made from S45C high strength alloy for strength and rigidity. The purpose is to replace the OEM arms by removing the soft rubber bushings that are most likely worned out. The adjust ability of the rear lower control arms in conjunction with the adjustable rear links can help to dial in camber and wheel track width for your intended vehicle use. The geometry of the rear wheel suspension alignment can be precisely dialed in to spec. The arms comes with powder coated blue finish.