Thick powder coating, very durable. Installation required moving the differential and removing the passenger axle (the camber arm's internal bolt won't loosen the axle), but that's BMW's fault. When installed, the camber adjustment can be turned by hand in the middle when the lock nuts are loosened. and the wheel moves very easily. The only thing I could wish for was that the inside of the bushing/bolt was longer and the center shorter as it is difficult to get to the inside lock nut in the subframe pocket.