Schedules change and so does your planning style. Use these insert sheets to change up your weekly schedule when the mood strikes or use them in addition to the Vertical or Horizontal weekly pages in your planner.Important Notes:- Inserts have mylar-coated tabs that pop into the coil of your Undated planner- 12 pages of inserts per package, double-sided- Each insert has 4 columns - Mini Planner Size: Full Sheet Size: 8.25in w x 6.75in h - Standard Planner Size: Full Sheet Size: 11.5in w x 8.5in hWe do not suggest adding more than 12 sheets of paper into your current planner at a time. If you'd like to add more, you will have to remove all of the extra back note-taking pages and still we do not recommend more than 20. Pro Tip: Gather the used inserts and save them in your favorite 6x9 envelope and put that in your cover folder for safe keeping. Please note: these inserts do not work in our Portrait Planner