custom binders magazine binders leather ring binder CUSTOM BINDERS Let us build custom binders for you. Metropolitan Loose Leaf is your direct source for custom binders. It is this combination of people and technology that has enabled Metropolitan to become a leader in custom made binders.Our custom 3-ring binders and index tab dividers are the made from the highest quality materials available and we have been specializing in custom binders & custom index tabs for more than a decade.