Since I was very enthusiastic about the screen protector for my Sony SLR, which, however, 10 euros / unit was more expensive by a multiple of about, I also wanted a protector for the Sony Walkman. For this there were only these favorable protectors, and then in the same 6-pack. That alone should make already distrustful. During installation I have kept exactly to the instructions and I had as already mentioned experience with screen protectors. However, a bubble-free attachment was me this time is simply not possible, according to the third protective film I have tried then abandoned and the remaining equal tossed with the trash. A spreading of the bubbles is also not possible. The display looked like Swiss cheese. It seems as if the adhesive lacks the protector easily in many places. In the 10 Euro protector for my camera there were no such problems.