This is a set of 4 Tire Pressure Monitoring Sensors (TPMS) that I used on aftermarket wheels on my 2012 Model S. Information from Tesla: Use of the new (Continental brand) TPMS started in September 2014 at or after VIN ...P50900. These are the earlier TMPS that will work on 2012 and 2013 cars, and 2014 cars up to the VIN mentioned above. They were purchased with my aftermarket wheels, so they are not directly from Tesla, but they worked great on my car for the last year. They were painted to match the wheels, so they are a metallic grey color which can be left as is, or remove the paint, or paint over them to match your wheels. $50 for the set. Located in San Jose, CA.