Description Made of high-quality metal and PC material, this car tire pressure monitor set, including 4 tire pressure caps, 4 screw nuts and 1 spanner, is durable and practical. Visually alert you when the tire pressure is low to help avoid premature tire wear or blowouts from under-inflated tires. Features -Color: Silver Material: Metal and PC Packing Size: Approx. 14 x 9.5 x 3 cm:-5.11 x 3.74 x 1.18 inch.- Made of high-quality metal and PC material, durable and practical. This car tire pressure monitor set, including 4 tire pressure caps, 4 screw nuts and 1 spanner. Anti-theft nuts, not easy to be taken away Use the wrench to fix the nut in the opposite direction, convenient and easy to use. Three-color warning, green indicates that the tire pressure is normal and safe. Yellow indicates that the tire pressure is low and warning. Red indicates that the tire pressure is too low and dangerous. Packing list: 4 x Car Tire Pressure Monitor Stem Caps 4 x Screw Nuts1 x Tensioner