Our tire pressure monitoring caps are designed to provide a visual alert for your car's tire pressure. These caps are easy to install on your tire valve stems, replacing the standard caps. Simply screw them onto the valve stems, and they will display -coded indicator to show the current pressure status. This helps you maintain optimal tire pressure, ensuring safety and improving fuel efficiency. Features - Color: Assorted Color -Material:Copper, plastic -Size:7.00X2.50X1.00cm/2.75X0.98X0.39in -Size:2.30X1.10X1.10cm/0.90X0.43X0.43in -Size:1.30X1.20X1.00cm/0.51X0.47X0.39in - monitoring: with the tire pressure warning cap, you can always be aware of your vehicle's tire pressure, ensuring safety during your drive. -Prevent abnormal tire pressure: the visual tire pressure monitoring cap can detect abnormal tire pressure in time, preventing excessive tire wear and extending tire life. -Easy to use: the tire pressure warning cap is easy to install without professional tools, simply attach it to the tire valve, making it very convenient and quick. -Versatile application: whether it's a private car, business car, or offroad vehicle, the visual tire pressure monitoring cap is suitable for various vehicles, meeting different needs. cost savings: maintaining proper tire pressure can reduce vehicle rolling resistance, lower fuel consumption, and save fuel costs, improving economic efficiency Package list: 4pcs x tire pressure monitor (4 caps + 4 nuts + 1 wrench)