We use these daily to practice letter formation. I have 18 students and wiping them off is not easy. We have tried black expo, office max, and dollar tree dry erase markers with no luck wiping them off cleanly. When you do get it to wipe off, it leaves a stain. We always erase our boards before putting them away and it is a pain to wipe off 18 peoples boards every day, so we switched to page protectors. I will say, they are really sturdy and I have had no picking or breaking of the plastic.See full review