Very nice.  Thick and durable.  I ordered two.  I've had them for over a year now, and cannot believe I have never had cracks or any problems with them (everything in my house winds up broken!).  The bottom sides are black.  They are a perfect fit on my end tables, which are also black, so they look like they were made to go together.  They reflect the light up from my lamps sitting on top of them, so it helps with lighting in the room.