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The right binder ring makes a difference in the form and function of your custom binder. The size of your ring determines the spine width while the intended use of the binder should determine the style of your ring.

3-ring binder rings - large - Corporate Image custom 3-ring binders with tabs and interior pages
sizing a 3-ring binder

The best indicator of which 3-ring mechanism you need is how much paper and what size paper you are putting in your binder. This will dictate the size of the ring you need. Whether you want boosters (the tabs on the end of a binder mechanism that help open and close it), will depend on aesthetics and how often the binder is being opened (boosters help keep rings from bending).

D-ring Binders

In a D-ring, the paper is held evenly on the right, meaning that your tab dividers all line up and there is a clean line of paper. A D-ring always mounts on the back panel of a binder – not the spine – so the paper rests on the flat part of the ring when it is closed. This makes the cover a little wider.


Round Ring Binders (O-Ring)

A round ring can mount on the spine of a binder, so the covers, front and back, are a little shorter. It is easy to turn pages since it is a continuous curve. The issue with seeing tab dividers toward the bottom of the stack of information is negligible in smaller rings and up to you to decide if it is an issue in large rings. A lot of people don’t see it as a problem. For people with small paper needs – you can get a 1/2″ O-ring binder!