I ordered some wet erase markers and grease pencils but while I was waiting, I tried a Pilot's Frixion series pen. In this case, I tried the 0.7 size pen as seen here. You don't have to press very hard and it comes off with a tissue just fine. There are some 0.8 erasable ink pens that might work also. I also tried the 0.4 pens, not much like.