- 24 mm (~1 in) diameter - holds up to 120 sheets
- 32 mm (~1.25 in) diameter - holds up to 140 sheets
- 38 mm (~1.5 in) diameter - holds up to 160 sheets
Enough discs for US Letter (Happy Planner Big), Happy Planner Classic, Half Letter, or Happy Planner Mini.
Compatible with Levenger Circa, The Happy Planner, Office Depot/Office Max TUL, Stapes Arc, and Martha Stewart systems.