JessicaAlba® Tire Pressure Monitoring Valve Cap， (Pack of 4)<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Material: Chromed Metal Round Style: 36PSI Visually alerts you when the tire pressure is low to help avoid premature tire wear or blowouts from under-inflated tires</li><li>Enhances road handling， increases economy， extends tire life Green/yellow/red system indicates level of proper tire inflation Increases fuel efficiency， safety and control</li><li>For use on 32 pound per square inch recommended pressure Simply install on the air valve</li><li>Indication: Green shows that tire pressure is normal Yellow shows that the pressure is down about 5 pounds Red alerts you that the pressure is down by at least 10 pounds</li><li>Package : 4 x Tire Pressure Indicator Valve Stem Caps</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41hTY0EvDOL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31nlkHFsWML.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41B7pDkStUL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41gn9rRDc7L.jpg" noproxy>