30 Day Undated Erasable Planner 38 in X 24 with Marker and Marker Clip Dry AND wet erasable! The best of both worlds. :-) Markers will not ghost or stain. Our special film surface performs better than all of the others Our calendars easily unroll and lay flat. Installation is a breeze! Thicker calendars stay curled making installation a nightmare. Once installed, calendar thickness is irrelevant Recyclable! We make the only erasable calendars that can be recycled with household waste 24" x 36" Horizontal format. Date Blocks are 5-1/4"" wide X 4-1/2" tall