The package contains 4 sets. (8 large and 4 small covers)
The installation is very easy and they are almost invisible.
They are not as stable as the screen protectors that don't move a millimeter. These, if you rub them hard, slide out of their position, so you need to be a little careful when you want to clean the lenses from fingerprints. I have had the first set for 6 months without any problems.