Well, that the plastic hooks on the sides not scratch the extremely sensitive aluminum case, I can not imagine me honestly. That will probably turn out but only after some period of use. What is certain is that it is not easy to remove these Protective again. The plastic hooks are rock solid and it is a disturbing amount of force necessary to resolve these again. If you still consider that you will want to lose the envelope anyway after some time, because there simply dirt / dust accumulated, the method of attachment falls especially negative effect on ...