Three Black Grey Marble Salvage Slabs from the Conrad Hotel in Massillon Ohio.These were used as the wall stringer on the stairs.One measures 63 long x 13 1/2 to 14 inches wide. One is 50 1/2 inches long x 13 1/2  inches wide.And one measures 58 inches long x 13 1/2 inches wide.They are all 15/16th inches thick.One side is polished and the other is not.They have some sort of fossils imbedded that I believe are called ammonites. I prefer payment at pickup so they can be inspected before payment.