Product review (5 stars): Good brushes
I bought a set of these years ago for my own house and they have served me well.  They still look like new.  Recently my son bought his first house and I bought him a set.  They didn't sit around long as he quickly cleaned the dryer vent line from both ends.  He hasn't gotten around to cleaning the refrigerator coils yet, due to so many other projects, but at least there is not as much danger to them, just more energy usage.