I have a Toyota Prius and enjoy this car. One of the little things I've always had trouble with is the recessed tiny valve stem caps. I have a rear tire with a slightly rusty rim that is constantly losing air. So I have to pump air at every gas station (about every two weeks). It's always difficult, especially in the winter with gloves on, trying to reach that little recess in the wheel well and grab those little valve stem caps. They were always too small and difficult to grab and turn. I just put them down recently. They are strong, with ridges running in opposite directions, making them very easy to put on and take off. I went to inflate my tires and all I had to do was lean forward and spin them and they took off immediately. I usually have to search and turn 3 or 4 times before I can get the valve stem cap to move. I can't comment on long-term durability, but they seem to be durable. They don't feel plastic or flimsy.