If it "looks" like anything other than mat board that did a darn good job. It looks like a black core mat. I guess this could be added to the "stories we hear from other shops" thread. But this lady said that the other guys said that they actually USED to carry this mat and it was made by "??????". I had never heard of this company so I don't remember what she said.
Anyway, I found some material that matches pretty well. I was thinking if I mounted this to the mat and cut it, would the threads fray and look like poop? Would wrapping it around the mat with a reverse bevel be an option? Tips? If I did wrap it how do I protect the print from the fabric? Thanks friends!