That must be the SSS or "Says Stainless Steel" variety. What does tensility have to do with relative hardness? I have Tornado brushes and don't use them. As I recall, the theory was that bristle ends scratch; complete loops with a smooth round section and of a hard material which does not trap and embed abrasive grit would not. Anecdotally, when I WAS using them, it wasn't hard to get a choke tube carbon/plastic deposit which would easily defeat their ability as scrapers. I like crud-busting solvents and I like 4/0 steel wool.
jack
