Mega Office Supplies has the widest range of ring binders that you can buy online now. We offer the complete range of Bantex ring binders, Bantex insert binders, Marbig ring binders and Marbig insert binders. Other ring binders offered are Cumberland ring binders and insert binders, Colby POP ring binders and our very own private label of Aspire ring binders, plus more. So if you are looking a ring binder, be it and A4 binder or a A4 insert binder, there is only one place to check out a mega range buy the ring binder or binders that you are after. Probably our most popular colour is white in a ring binder but surprisingly enough, there has been an increase in people looking for binder a4 2d ring pvc 25mm black. When looking at purchasing a ring binder or insert binder, you need to consider a number of features. Most importantly would be the ring capacity, ring type, ring size and the number of rings in your ring binder. The most common ring binder size are either a 2d binder, a 3d binder or 4d binder. This refers to the number of rings and the shape of the ring, in this instance it is D-Ring shaped. The greater the number of rings, the more stability you will have for your pages, thus reducing damage. Other ring binder types are an O-ring and slanted D-Ring. The size of the ring is measured from the base of the ring to the top of the ring. O-ring binders usual take up to 200 sheets (50mm ring height) whilst d-ring binders take up to 350 sheets (65mm ring height). The smallest ring height is 16mm and also come in 19mm, 25mm and 38mm. The Slanted D-ring binder holds 20% more sheets, it is 89mm high and takes up to 600 sheets.