Adopting stainless steel, PC and copper materials, these valves stem caps for car tire pressure monitoring are durable and practical. Visually alert you when the tire pressure is too low, can greatly avoid premature tire wear or blowouts from under-inflated tires. They are good monitoring tools for your car. Features - ColorAssorted Color - Material: copper, PC, stainless steel. - Size: 2.50X1.00X1.00cm/ 0.98X0.39X0.39inch. - Adopting stainless steel, PC and copper materials, these valves stem caps for car tire pressure monitoring are durable and practical. - It has outstanding craftsmanship, no burrs, you can use them rest assured. - Built-in anti-leakage sealing ring with thread, waterproof and , to prevent chronic tire leakage. - Use the wrench to fix the nut in the opposite direction, more convenient and easier to use. - Three-color warning, more obvious, saves of time and efforts for you. Cautions: Normal: Under the condition of standard tire pressure, the transparent +A15: window should be green, and the vehicle is running normally Warning: The tire pressure is slightly lower than the about 10%, the transparent window is yellow-green, and it should be inflated in time. : The tire pressure is lower than the about 25%, the transparent window should be yellow, and it should be checked and inflated immediately. Package list: 8 Tire Pressure Monitor Caps 8 x Screw Nuts 1 x Spanner