Where I work we use binders from Staples for frequently referenced procedures. They are molded hard plastic. The binder rings are mounted to the back, not the spine. So the pages lay flat with book open. The hinges of the covers are a high wear black rubber, along with the outer edge of the front and back cover. On the Staples website they are listed as Staples Better Binder, with an item number of 648812 for a white binder, 1”. Photos of ring system. Available in 13 colors from 1” to 4” thick.
We have them in three colors: green for daily use documents, yellow for abnormal event procedures and red for emergency procedures. Some have been in use for over 10 years, and the only time I’ve seen one fail was when someone tore off a cover when part of the book was stuck in a file cabinet.
The rings snap close with authority, and cannot be opened without pushing an unlock tab at the bottom of the ring unit. The rings also are a pin and socket design, not the wavy teeth style of standard binders.
They are pricy at $9 and up.