valve covers are very heavy. I was impressed with their build quality when I took them out of the box. They look great and while I wonder if anyone will notice I have Ironman helmets on my tire valve caps, I love knowing they're there. They were fairly easy to tighten on my valves and I've checked them a few times since initial installation. They were tight when I checked them. I wonder if they stay tight the longer I ride them? So far it's been a great addition to my car.