Special dry erase film "clings" to nonporous surfaces -- great for whiteboards! No adhesive, no residue! It is easy to reposition and it is reusable. Perfect for demonstrations. Use dry-erase markers to easily write on and wipe off. Great tool to have during class to visually show students how to graph and work out other problems. The calendar charts are a good resource to help keep you and your students organized and up to date with the schedule.