Plastic Film SCREEN PROTECTOR
(NOT TEMPERED GLASS)
The protector will be 3-4mm shorter than the edge of the mobile. This is normal.
All screen protectors (including those from Apple) have this margin of error on the screen protectors. This is why they do not cover the whole of the phone as it ensures that they can be put on properly without anything sticking out etc due to the slightly curved edges. With this it ensures that no dust can creep onto the phone's screen. Furthermore it allows you to put a case on without breaking the protector.