I initially thought the black was the backing to the seat cover…turns out I got a 2fer….and not in a good way….about halfway through the removal of the blue cover’s staples….I realized there was a hidden row of staples securing entirely different seat cover….Took me an hour n a half just to get em all after the hand cramps …..I’m just glad I had a decent electric staple gun on hand 😢….but I think it came out exceptionally well