Product review (5 stars): Very flexible
I bought these to clean out my dryer vent after my heating element burnt out. I wanted to make sure a clogged dryer vent didn't cause it to burn out among other things. I was worried this wouldn't work because my dryer vent has two sharp turns and is made of a cheaper foil material. I had no issues at all with the curves or with damaging the ventilation. I didn't hook it up to a drill just to be cautious so I wouldn't tear the ventilation. Highly recommend.