Wonder Stix can just about write on any surface such as markerboards mirror wood and paper. Let your imagination can run wild. They create bright permanent colors on poster boards wood cardboard and paper yet are erasable on some surfaces. Just wipe off whiteboards when you're done. They even wipe off glass and windows when you add a touch of water. Wonder Stix are dust-free and odorless. They have no caps so you don't have worry about losing them. Wonder Stix are not for use on chalkboard paint.