Dude, you gotta stop that winding thingy on your mp3.
Even if you had expensive IEMS, you still got wind that up with your player?
Sooner or later, its going to get spoil if you do that even if the built is good.
Uhh soooo, I really wouldn't recommend doing that. Just keep them in a case. If you want a solid built, get the UM1. The cables are really tough. The cables on the mylars are the rubbery kind, so it doesn't feel quite strong. downside is, price iof um1s almost 2.5X more than mylars.