It reminds me of burlap micartacute.
not familiar with ultrex micarta - time to google!
It’s black, but has a different texture than canvas. The knife is 7” overall with a 3” blade 1/8” thick.
Just buy it. You know your already at the bench kicking around what kind of sheath you wanna make for it.That’s gonna be hard to pass up it’s in my EDC sweet spot! Hopefully this business trip won’t burn to much of my money and I can snag it.