Nope Nope Nope I don't know what a carper is but it's not for a hallway. Not carpet either (maybe carper was a typo).
We need to nail this on Eric. Because he's pulled this on out of the hat. He's got me stumped for now. You and I have to really really think on this one. Bazz888, has come up with a real humdinger , for us my friend .
Nope That's quite a good guess. Totally wrong though lol Nope. How quickly do you use your vacuum cleaner that it needs tread?? Lol Nope Not that Nope Eh, nope Nope. Some have asked for a clue. I'm finding that as difficult as you are lol Ok, so it's black. Plastic type material. There's metal inside. It's part of another shape of item that's similarly described. Hth