I actually just made this observation right now as we speak on my bros mbp.....if you lightly knock on the screen it has a very significantly plastic feel to it. I guess its a form of glass still?? If you gently push against the screen with your finger, then even more so you get a plastic-y feel from it because the screen kinda pushes in and out, as if its a plastic layer atop the actual screen almost, or something, i dunno lol. It feels flimsy, not like solid, hard glass.