The title says it all - this is a heavy duty green binder. This is substantially haavier duty than the standard binders and takes a lot of wear and tear. The rings are open and close smoothly.
Disappointed. The binder was not heavy duty enough. Just days after using the binder one of the rings was already off alignment. My Middle Schooler; a non-rough girl kept it in her back pack. It was not overloaded with paper or misused.
I needed something to hold my lab notebooks that could take a decent amount of punishment. This binder fits the bill nicely. The periwinkle color makes it easier to keep track of my lab manuals I keep having students steal them when I use navy blue binders.