The 4 screen protectors were sent in an ordinary envelope, the mounting instructions supplied has also envelope size and is easy to understand.
I proceeded slightly different from the installation instructions:
1) The cleaning of the smartphone surface I have not done with the supplied cloth, but with "Sidolin streak-free with alcohol" and a microfibre cloth.
2.) The bubble-free application of the protective film succeeded me - except one place - very fast and easy. When a point is the opening for the front camera, which was indeed punched correctly, but the punched out part could not be peeled off together with the cover sheet. I had the film again stand out from the display glass - unfortunately there is the release liner on the opposite side. In the first experiment, I pushed the peeled cover film betwee display glass and protective film, whereby the protective film has received minor scratches, behind which small bubbles have formed. On the second attempt I have the stamped recess for the front camera with a piece of scotch tape - without lifting the screen protector - from above. This worked perfectly.
Overall, the film is doing what it should - protect the screen from scratches. After two weeks use is no fatigue of the film determined. The display quality is - as opposed to anti-reflection films - not affected. The feel of the touch screen operation has changed slightly - the finger is a little more slowed down than without the foil. For this, the film reduces the "fat finger streaks".
For this price (0.75 euros per film), a real recommendation.