The Currency Note Files or D-Ring Binders or Ring Folders for notes is basically a type of note album where you have 4 D shaped rings that hold your currency note sheets firmly. You can add new pages or sheets later or sort them the way you like. So it gives you more flexibility on organize and rearrange your collection the way you want it.
The Chain D-Ring binder is a special D-ring binder that has a smooth enclosing chain covering the file completely. Thus protecting your collection from dust and other dirt.

As a best practice in preserving notes, we highly recommend putting the currency note inside a protective currency note sleeve first so as to protect it form dust, dirt and finger oils and then put into album pocket.