WOW Air indicator valve stem dust caps!!👌.Great for. 👉*Short haul drivers, Van delivery, cabbies, taxi's, and Trucks and Cars*👈And any tire that carry more than 36PSi (Pounds on Air!!) They are great!!👍. And this is how it work, for you that don't know how it work!! ,👉You just fill your tire up to 36 PS I to 65 PS I👈 Than you put these caps on and if the air drop below 36 pounds it will let you know by just looking at the cap!!.. the cap has a red, yellow and green indicator inside of it!👌.The Green mean good, the air in the tire is safe 2 Drive! The yellow mean check air or add!! The red mean you're in danger!! ☝These are especially great the Woman drivers!! Now Its getting cold drivers Now wouldn't you like to just walk by your * vehicle* an look down at the tire and know how much air is in your tire!!👍. Now isn't that's a great idea!!👍.So buy these now I will ship them to you within 3 to 5 business days so you can use them before it gets