I need more than 12 dividers, what should I do?

We only say 12 parts max because otherwise the tabs become to small to be practical. If you had 14 dividers, this would essentially be 2 sets of 7-part dividers.

What materials are the tab dividers made from?

We typically used 350gsm board and optional lamination improves the longevity of the tabs. We offer premium options printed on plastic with slightly longer turnaround times.