I bought two pieces to try to put one on better!!!
What I got didn't have adhesive all over the screen but only around the edges as it should. But it's slightly bigger than the watch glass, so it sticks out and can easily come off!
Overall, it didn't bubble or have lines like I read in the reviews, but in terms of quality, it's not the best because it's not glass but something like plastic-glass together...
However, you can see clearly as if you're not wearing anything and the touch is perfect

The worst thing I have ever bought... The previous one I had purchased from China for 0.50€ was much better. The screen is filled with bubbles, it is slightly smaller than the screen and covers the edges, and the touch sensitivity is not as good. In short, stay away..

I bought 2 and I couldn't place any because when I removed the plastic film to stick it on the screen, it would come off and stick together, and then it wouldn't make good contact with the screen (I have used screen protectors before)

Very bad product! I bought it to use it on an Apple Watch 4 44mm. The "glass" is full of glue on the entire surface of the glass and not around it, as it would be logical. The result is terrible! You have a screen that you can't see anything