Hey Lostbears, I'm going to give Skreich the first option on the cones since it's his thread but yes I do also have the z-slab. It's the square one 18 3/4 x 18 3/4. It did sustain some minor shipping damage (a couple of scratches on top, what looks like electrical tape around the edge got chewed up a bit, and a corner chipped on the bottom) but all in all I think it would be pretty presentable once in the rack with a component on top. I was using it under an amp for a while and it didn't bother me.