Vktech Hot 8pcs 36 PSI Tire Pressure Indicator Valve Stem Caps 3 Color Eye Alert Fit on any standard size existing tire valve stem Visually alerts you when the tire pressure is low to help avoid premature tire wear or blowouts from under-inflated tires Indication: Green shows that tire pressure is normal. Yellow shows that the pressure is down about 5 pounds. Red alerts you that the pressure is down by at least 10 pounds Material: Chromed Metal Install This new pressure cap tight