I bought them for our second M3 and bought the first from Tesla for $ 50. It was way better and the quality was great. These are plastic parts no matter where you buy them. Importantly, the metal ring that secures the center cover is genuine and durable. The screw caps fit well, original Teslas were always just a careless car wash away from losing them. In fact, you have to take them off. Haven't opened the valve covers yet, but they look good. I'm thankful for the matte and gloss options. I still occasionally use AeroWheels for longer distances, so I recommend getting a small mini flathead screwdriver for smartphones and tablets if you don't already have one to remove the center cover. You won't be chewing on the edges of the center cap. Screw caps can remain under the AeroWheel.