Solved my overfill 4" notebook problem. I like that the rings are not circular but fairly straight top to bottom. It holds a large number of pages very well. The front cover also hinges a couple of inches past the end so it covers the pages better when it's full. I do wish it came in more colors than black but for function this product gets five stars from me.
It is a very large 3 ring notebook that I needed & it will serve me very well. It is extremely strong & will hold many if not most of everything I wanted to save in it.