Description These valve stem caps for car tire pressure monitoring are made of sturdy materials, ensuring their durability and practicality. They serve as visual indicators, alerting you when the tire pressure is too low, which can help prevent premature tire wear or blowouts caused by under-inflated tires. Features -Color:Silver -Material:Metal -Size:2.30X1.20X1.20cm/0.90X0.47X0.47in -Note:Display tire pressure according to identification color, green means normal tire pressure; yellow means pressure is 10% lower than standard; red reminds you that normal pressure is 25% lower than standard. -These valve stem caps for car tire pressure monitoring are made of sturdy materials, ensuring their durability and practicality. -Exquisite craftsmanship ensures that there are no burrs, making the car tire valve caps safe to use. -Using the wrench to fix the nut in the opposite direction makes these valve stem caps more convenient and easier to use. -The color warning system is more obvious, saving you a lot of time and efforts, the car tire pressure valve caps are easy to use. -Made of sturdy materials, these tire caps are safe to use and provide a comfortable user experience.Package list: 4 x Car Tire Pressure Monitor Caps 4 x Screw Nuts 1 x Spanner