16 PCS Universal Tire Valve Stem Caps, Waterproof Airtight for Cars, Bicycles, Motorcycles, Trucks (Black)

I have all kinds of inflatable tires around here: 4 on the truck, 4 on the tractor, 4 on a heavy duty rolling cart, 4 on the hand cart. And it seems all of them are prone to lose those plastic valve stem caps.I installed caps on all but the hand cart – and they all seem to be staying in place quite well. I did almost lose one – but that was due to the air guy at the tire shop not screwing it all the way down after inflating my tire.All-in-all, these are a really good value for the money!