The full face tempered glass is a full coverage tempered glass specially designed to protect your mobile phone screen from scratches and other damages. In case of a drop, it does not guarantee that the screen won't crack along with it, but it provides an additional layer of protection.
The black frame covers the entire surface of the screen, including the edges. It features adhesive on the entire surface, unlike edge glue screens that have glue only around the perimeter. This helps with a better application and smooth operation of the touch screen. Additionally, it prevents dust from getting underneath, which can happen with edge glue screens when the adhesive around the edges wears out.