The Dragonfly Marble Expanders Discs from the Happy Planner Collection makes it so easy to customize your Happy Planner (sold separately), create an additional planner, notebook, and anything else that you can think of. Included in the package are 11 expander planner discs by me & my BIG ieas that measure 1.75". These expander discs give you some extra room to Franken Plan your perfect Happy Planner.