Product review (1 stars): Do not buy this; pain in you-know-where
Very difficult to work with.  Brittle.  Hard to expand. Hard to attach to other parts of gas dryer vent system.
It works once you get it connected, Go with a flexible hose that is fire-resistant and save yourself a headache and cut fingers.
I threw it in the garbage and went back to using a flexible aluminum hose that is fire-resistant.