This is a nice stroller with adequate room for my 2 medium terriers.
The mat they provided is very thin, so I had to spend a little more on a mat with padding.
The stroller is mostly made of metal but also has plastic for the brakes and the handle locking mechanism on each side of the stroller. 
It was easy to put together, but extremely hard to stretch the handle to the other side, to slide into the tube. I still have to get used to navigating 2 dogs in the stroller, but it seems to meet our needs.
This is a good purchase.