The full face tempered glass is a full coverage tempered glass, specially designed to protect your mobile screen from scratches and other damages. In case of dropping your phone, it does not guarantee that the screen won't break, but it provides additional protection. It does not affect the functionality of the screen.
The black border covers the entire surface of the screen, including the edges. It has adhesive across its entire surface, ensuring better application and trouble-free operation of the touch screen. This minimizes the risk of dust ingress from underneath, which can happen with edge glue glass protectors when the edge adhesive wears out.
It can be removed at any time without leaving marks or causing issues with the screen.