Ford Performance part # M-1180-B. Kit contains 4-valve mounted snap-in tire pressure monitor sensors (valve stem TPMS) and tire pressure monitor activation tool. Warning: Requires wheels specifically designed for valve-mounted snap-in-tire pressure monitor sensors. Valve stems are not designed for speeds over 155 mph. Failure to install and activate sensors will cause tire pressure monitor light to remain on. Sensors operate on a 315MHz frequency. Even with our huge inventory, we may run out of an item. Items must be New, Unused, Not Installed, in the Original Packaging and able to be resold. Please message us to start a return. No cash or compensation for labor will be given for defects in material and workmanship. We encourage our Buyers to communicate with us at any time. All emails will be responded to within 24 hours. We look forward to hearing from you!