Brand New and High Quality!Material: PlasticSize: 23x9mmColor: As showQuantity: 4pcsFeatures:--Green shows that tire preure is normal.--Yellow shows that the preure is down about 5 pounds.--Red alerts you that the preure is down by at least 10 pounds.--Determine the correct tire preure for your tires.--Inflate tire to correct preure.--Install This new preure cap tight.--Simply look at the color to know if your tire is low or normal.Notes:-Please allow little differs due to manual measurement,The above dimensions are only for reference.-Please be reminded that due lighting effects, monitor's brightne/contrast settings etc, there could be some slight differences in the colour tone of the website's po and the actual item.Package Includes: 4*Tire Air Alert Cap