Heidi Swapp-Memorydex File Cards And Tabbed Dividers: Calendar. A great way to add a creative touch to your Memorydex (sold separately). This package contains twelve 4x3-3/4 inch dividers in twelve designs (one for each month) and eighty-eight 4x3-1/4 inch cards. WARNING: This product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm. Do not mouth or chew. Imported.