Expo dry-erase markers are erasable from porcelain dry-erase boards as well as glass and unpainted metal. Their plastic color-coded barrels make color identification simple. The specially formulated low odor ink is ideal for classrooms, small offices and homes. In sets of four markers. Primary Color Sets include black, red, blue and green. Fashion Color Sets include intense purple, blue, green and pink. Tropical Color Sets include aqua, lime, pink and turquoise.