Unlike most injection-molded nylon designs, the Lodestar Front Axle Sliders are CNC-machined from premium 6061-T6 billet aluminum to offer added protection for the driveshaft casing, hub, wheel and final drive on select BMW models. CNC-machined 6061 aluminum with black anodized finish Adds rugged style while protecting vital components by minimizing damage in the event of a fall Easy bolt-on installation with included hardware - no permanent modification necessary Includes left and right axle sliders plus drive shaft housing slider