Screen Protector for smartphone galaxy s4

I have used several types of screen protector that did not satisfy me and whose creation was laborious and always staying with air bubbles.
This is the first time this happens to me a screen protector in less than 10 seconds without any air bubbles.
Furthermore the thickness of this protection much better protects the screen and if I have to take other protection for smartphones or tablet I would resume the KW-commerce brand that I highly recommend.