Omnimed's formed 2.5" ring binders are made of hospital grade tri-polymer material that is durable, flexible, and easy to clean. Our binders come equipped with our patented twin-hinge system; sheets are easily added and secured in the binder. They are built to last and can withstand repeated abuse without ripping or ring failure. These binders have a heavy-duty 3 - ring system and come in a variation of fade-resistant colors to compliment your office needs. Each binder can hold up to 450 plus sheets.