Sanford Expo 4 Pack bold color dry erase markers. Liven up your classroom with a burst of color from Expo Markers. These brightly colored markers command attention even from a distance. These markers erase cleanly and easily and can be used on white boards, glass and non-porous surfaces. The certified AP nontoxic ink formula conforms to ASTMD 4236. Assorted 4 pack includes Black, Blue, Red and Green.