black rubber. 1st Design. Exc.Performance Package. Incl.Cap. Part serviced with Tire pressure monitor Sensor. Part serviced with TPMS Sensor. Ride & Handling Suspension. Single Rear Wheels. Tire Valve Stem. Unit installed in Wheel which typically includes the Sensor, Stem, and Valve. Pressure Monitoring Sy and Assembly. Repair kit. TPMS Assembly. Included with: Pressure Sensor, Sensor, Tire pressure monitor Sensor, Tire Sensor.