Product review (1 stars): STAY AWAY
The segments are made of plastic that are going to snap in anything but straight system. That's what happened to me and it made me a lot of work as I had to cut the drywall open to take apart the ducts to get to the stuck brush inside the duct.

So if you do not have a straight duct STAY AWAY!!!

I bought it at local store. But here are plenty of people with same issue.