Confirm the sheet size, tab position, collation style, and how the tabs will be punched or assembled into the binder. Buyers sometimes focus only on the numbers, but the filing system still depends on the physical format matching the rest of the set. A numbering run is only useful if the tabs line up correctly in the binder and read clearly during daily use. It also helps to think about paper weight and how often the binder will be opened, because durability matters once the set is in active use. The stronger buying decision comes from treating these tabs as part of a working filing structure, not as a loose add-on that can be dropped into any binder without planning.