Section dividers usually cost you thickness. These run thin enough to sit through a full planner without pushing the covers apart, and the three tabs are staggered across the top so every section stays reachable.
The frosted surface carries a fine printed grid that works as a backdrop for whatever you put on it. Sticky notes and page flags hold, and the grid takes a small calendar, a task list, a habit row, or a kanban column. Pens are not recommended on the surface. For a label that stays, use a permanent marker such as DecoColor or Sharpie. Available in multiple sizes for ring-bound and discbound planners.