Description: 【Package Including】: You will get 4 tire pressure monitor valve stem caps sensor indicators, each approx. 0.9 cm x 2.3 cm/0.35 inch x 0.91 inch 【Premium Material】: The air caps are made of premium copper and alloy material, wear resistant, sturdy, and ensures a long time to use 【Function】: The tire pressure monitor valve stem caps visually remind you of the pressure of the tire through different color displays, transparent view window, clear at a glance, ensuring the security of the driving 【3 Color】: Normal: Under standard tire pressure, the window should be green and the vehicle can run normally; Warning: The tire pressure is slightly lower than the standard by about 10%, and the window is yellow green. It should be inflated in time; Dangerous: The tire pressure is about 25% lower than the standard, and the window should be yellow red. It should be checked and inflated immediately 【Wide Applications】: Universal tire pressure monitor valve stem caps, suitable for cars, SUVs, trucks, motorcycles, bicycles, etc Specification: Material: Copper Alloy Size Chart: 0.9 cm x 2.3 cm/0.35 inch x 0.91 inch Package Includes: 4 Tire Pressure Monitor Valve Stem Caps Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.