Up for sale is a Pittsburgh Steelers NFL Billiards Ball Set Collector's Edition. This set does not have numbers on the other side. Both sides are identical and I'd imagine for display in the rack on your pool table. They come in original package but there are marks on some of the balls.
I did not try to clean them off but may come off with a Mr Clean eraser. This item is in the category "Sporting Goods\Indoor Games\Billiards\Balls\Complete Ball Sets". The seller is "lkrinerwinner" and is located in this country: US.