Reversible: Plan three or four months at a time. Write-on/wipe-off surface for use with wet-erase markers. Side One: Horizontal four-months undated with space for notes; Side Two: Horizontal three-months undated with space for notes. Wet-erase marker included. Dated/Undated: Undated; Calendar Format: Quarterly; Tetra-Monthly; Calendar Spread Format: Horizontal: One Quarter per Page; Vertical: Four Months per Page; Academic Year: No.