Product review (5 stars): Galvanized and works as hoped!
I don't know why dryer vents are so difficult to install / hookup, this is not any better in that dept. but, it allowed me to push the dryer back almost 4 inches further than with the tube I had.  And I didn't worry about smashing it.  Once to teh correct length, I did tape the whole thing with aluminum duct tape.

And it DID come with the 2x6 rectangle to round 4 inch which I would have paid an additional $20 for by itself!