At first I wondered why they put 3 filters, now I understand better! The document is totally incomprehensible if you do not speak German or English fluently and drawings suck. Of the three films, two one ends in the trash and the third was stuck as we have but it is poor ... The "bubble" pass between the film and the screen and the film tends to peel off slightly. With a bonus scratch after one week. My worst purchase on Amazon, luckily it does costs "only" 5 euros, which is already very expensive for what it is. In short, I recommend.