90/120-Day Undated Horizontal Erasable Wall Planner, 36 X 24, White/blue Sheets, Undated Calendar is undated for flexible planning. Erasable write-on/wipe-off surface helps you to manage changes to your plans. Reversible format has a 90-day calendar on one side and 120-day calendar on the other. Each side has unruled daily blocks. The 90-day side also has space for notes and next month priorities. One wet erase marker is included.