Price is for a set of 4 valve stems. Qty 1 = 4 stems. These are Dill part number VS-950S chrome sleeved rubber snap in tpms valve stems. The sensor mounting post end is the common double D with two flat sides and two convex rounded sides. These are ONLY for vehicles equipped with tpms where the sensor attaches to the threaded post on the back of the valve stem with the torx head screw and the tpms sensor can be removed. It WILL NOT replace the one piece tpms sensors with aluminum stem made on them that is used on early domestic tpms equipped vehicles an imports. The chrome sleeve must be removed to install them, you take it off and pull the stem in the wheel with a stem puller then reinstall the sleeve. TPMS SENSOR NOT INCLUDED YOU REUSE YOUR OLD SENSOR.