100% ERASABLE - Well treated dry erase reusable film. We use well treated film on the surface of our calendar, which make the surface is smooth enough and the writing can be wiped clearly. It cooperates well with all kinds of whiteboard marker, dry erase marker and chalkboard marker. GIANT SIZE CALENDAR (38 x 50 ) WITH 2-YEARLY CALENDAR AND WEEKLY CALENDAR- Our giant calendar allows you to use it flexibly according to your requirement. One two-yearly calendar and one dry erasable weekly planner are included. BIG WRITING ROOM- The size of square per date is 6.5 inch by 5.5 inch.