Unfortunately, this silicone case is not dirt. On the front it does not matter, but because it is soft, light comes dirt and dust (when carried in a pocket) betw. The silicone sleeve and the iPod. The dust then acts like ne sand grit, and zerkratz all stainless steel back.
Wheel-Fct. works for me but perfect, because I was too sensitive scrolling from iPod. To optimally
