A special coating on each Flip-Mat allows you to use wet erase, dry erase, and permanent markers with ease! Removing permanent ink is easy—simply trace over any permanent mark with a dry-erase marker, wait 10 seconds, and then wipe off both marks with a dry cloth or paper towel. The mat is 24″ × 30″, folds to 8″ × 10″, and features 1″ squares on each side.