They appear to be very thin glass glued to cardboard. I peeled one like one of these off a door in the boat, (where I got the idea) and it came off in little bitty pieces. Yes it will break, but not be any danger that I can see.
And Doug, this was about $20, not $42, and yes the cameras would / will be cool, but I still wont be able to see everything in cameras that I can in these mirrors with out a dozen or so cameras. If you can come up with a few cameras for a couple of bucks apiece, bring em on!
Might be hard to tighten that fuel pump fitting, that I can see in the mirror, standing on the bridge looking at a computer screen.....................
Oh yea Doug, I've seen your engine compartment. Don't remember seeing a mirror OR a camera!?!?