Someone keeps stealing them from a lot of people I know and when I noticed mine were missing I decided to order new ones. I wanted to buy trendy ones and realized that I should probably buy the cheaper ones in bulk because they really only serve one purpose. They aren't as tight as the better ones and have plastic threads, but so far I'm very happy with them. I put them on about two months ago and they are still in the same condition as they were originally so I'm happy :)