That looks like a piece of carpet trim that you could get from any carpet layers supply house.
Since I'm kinda broke these days, I went a different route....
It's Elastomeric roof coating.....At $63 per five gallon bucket, it's far cheaper and fulfills the same spec as rhinoliner, linex, or lizardskin. The surface, cracks, seams, gaps, etc are filled and sealed with a flexible, paintable surface that will not scratch, gouge or peel. Hopefully, it will deaden sound and heat as Lizard Skin advertizes their product to do. I used what was left over after doing the decking on my car trailer top and bottom and still have a bit left. The camo is to keep the floors from looking dirty after some use.