There is no exception for an expo marker, the off brands just don't compare and I have tried. These work great, nice solid lines and they clean up easily. This 36 count box is perfect for all the at home school we are doing in my house right now, I don't have to worry about my kids not finding one, but also would be the great size to give a teacher at the beginning of the year with all the school supplies. Also like that the box opens in a way to keep organized.