Quoted from dgoett:

They are mirco. Have you ever installed a new Mirco playfield? THe clear is super brittle. If you were to hammer in Tnuts like Stern does at the factory, you would have a pile of chipped and broken clearcoat on the table. Check out the metal wire guides on DI and Hobbit, etc. You'll see shattered clear around them.
As TheLaw says, they are putting protectors on the holes now, but the clear isn't any better. We have had one on route about a year and the clear is chipped SO badly - way worse than stern or Williams. On a $9k game this shouldn't be the case - hence why I won't add one to the collection. Love the game though.
All Mirco has to do is change the clear. Put a flex agent in it. I've installed SO MANY Playfield Renovations and HSA cleared playfields that never have problems like that. If you don't predrill the holes on top of the playfield on a Mirco, when you start the screw the clear lift right off the printed art and leaves a halo where it separated. And NO, it's not just an isolated indecent. Happen on 99% of them.