They slide on really nice. They stay on really well, but for some reason when I was four wheeling one of them fell off. So now I'm missing one and the other one is just sitting on my earring bowl in my room, because I can't wear it. I was surprised that it fell off though, because they stayed on pretty well unlike the glass ones.

These gauges are really nice. Easy to slip on and off and they don't fall out of your ears like some of them do. They don't have rubber rings to keep them in so I was skeptical about them at first, but they're really great.