Day-timer® Reversible Dry Erase Flexible Undated Planner, 30/60 Day Bilingual. 24" X 36". Flexible laminated undated planner. Write-on, wipe-off surface. Clean, bright artwork great for any work space. Reversible: side one - horizontal 30 day undated; side two - horizontal 60 day undated. Can be used with dry erase markers.