These tire pressure monitoring caps are a must-have for any car owner who values safety and efficiency. By providing a clear visual indication of your tire pressure, they help you maintain the correct pressure levels, which can lead to and reduced tire wear. The caps are easy to install and remove, making them a convenient addition to your vehicle maintenance routine. 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 -Continuous safety monitoring: the tire pressure warning cap ensures continuous monitoring of tire pressure, providing updates for safer driving -Extend tire durability: by identifying abnormal tire pressure early, the visual tire pressure monitoring cap helps prevent excessive wear and extends tire durability -Easy installation: the tire pressure warning cap can be easily installed on the tire valve without professional tools, offering a easy and quick solution -Versatile vehicle fit: suitable for a variety of vehicles including private cars, , and offroad vehicles, the visual tire pressure monitoring cap meets diverse needs -Economic fuel use: proper tire pressure maintenance reduces rolling resistance, decreases fuel consumption, and saves on fuel costs, promoting economic fuel use Package list: 4pcs x tire pressure monitor (4 caps + 4 nuts + 1 wrench)