If you are in need of a little more room in your planner, you will need these black expander metal discs for your Happy Planner. These discs are part of the Me and My Big Ideas Happy Planner Collection. There are 11 discs in this package with a heart cutout in the middle. These discs measure 1.75" in diameter. These discs will help you customize your Happy Planner, being able to add more filler paper, make room for extension packs, or build your own larger planner.