The binders are reinforced rubber on the sides. No more nicks on the fingers or splits down the binding. The rings open with the press of a finger on the release tab at the bottom which is great when having to open and close a binder often.
I needed a binder for instructional materials that would hold up for multiple classes and would keep materials neat and organized. This binder appears to be well made has extra features that are helpful and most importantly holds papers so that they are easily accessible and wont bind or slip out. Very happy with the purchase