Main Features: It is instantly visible if your tyre pressure is low by the colour indicators Easy to install Increased safety and tyre life 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 the tire pressure is normal Yellow shows that the tire pressure is down about 5 pounds Red alerts you that the pressure is down by at least 10 pounds Installation: Determine the correct tire pressure for your tires Inflate tire to correct pressure Install this new pressure cap tight Specifications: Item: Tire pressure indicator valve stem caps Application: Cars, trucks, bicycles, motorcycles, hot rods,street racers, etc Material: Chromed metal Round style: 36PSI Quantity: 4pcs Product weight: 6 g (one unit) Package weight: 30 g Product size (L x W x H): 1.0 x 1.0 x 2.3 cm (one unit) Package size (L x W x H): 13.5 x 9.5 x 2.0 cm Package Contents: 4 x Air Pressure Tire Indicator Valve Cap